[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmoven, expected cfm. This could be a intended override, but in most cases indicates a broken mod.
[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmfridge, expected cfm. This could be a intended override, but in most cases indicates a broken mod.
[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmcabinet, expected cfm. This could be a intended override, but in most cases indicates a broken mod.
[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmfreezer, expected cfm. This could be a intended override, but in most cases indicates a broken mod.
[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmbedsidecabinet, expected cfm. This could be a intended override, but in most cases indicates a broken mod.
[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmmailbox, expected cfm. This could be a intended override, but in most cases indicates a broken mod.
[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmcomputer, expected cfm. This could be a intended override, but in most cases indicates a broken mod.
[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmprinter, expected cfm. This could be a intended override, but in most cases indicates a broken mod.
[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmstereo, expected cfm. This could be a intended override, but in most cases indicates a broken mod.
[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmpresent, expected cfm. This could be a intended override, but in most cases indicates a broken mod.
[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmbin, expected cfm. This could be a intended override, but in most cases indicates a broken mod.
[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmwallcabinet, expected cfm. This could be a intended override, but in most cases indicates a broken mod.
[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmbath, expected cfm. This could be a intended override, but in most cases indicates a broken mod.
[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmshowerhead, expected cfm. This could be a intended override, but in most cases indicates a broken mod.
[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmplate, expected cfm. This could be a intended override, but in most cases indicates a broken mod.
[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmcouch, expected cfm. This could be a intended override, but in most cases indicates a broken mod.
[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmtoaster, expected cfm. This could be a intended override, but in most cases indicates a broken mod.
[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmchoppingboard, expected cfm. This could be a intended override, but in most cases indicates a broken mod.
[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmblender, expected cfm. This could be a intended override, but in most cases indicates a broken mod.
[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmmicrowave, expected cfm. This could be a intended override, but in most cases indicates a broken mod.
[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmwashingmachine, expected cfm. This could be a intended override, but in most cases indicates a broken mod.
[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmdishwasher, expected cfm. This could be a intended override, but in most cases indicates a broken mod.
[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmcabinetkitchen, expected cfm. This could be a intended override, but in most cases indicates a broken mod.
[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmcup, expected cfm. This could be a intended override, but in most cases indicates a broken mod.
[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmcookiejar, expected cfm. This could be a intended override, but in most cases indicates a broken mod.
[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmtree, expected cfm. This could be a intended override, but in most cases indicates a broken mod.
[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmmirror, expected cfm. This could be a intended override, but in most cases indicates a broken mod.
[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmgrill, expected cfm. This could be a intended override, but in most cases indicates a broken mod.
[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmeski, expected cfm. This could be a intended override, but in most cases indicates a broken mod.
[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmdoormat, expected cfm. This could be a intended override, but in most cases indicates a broken mod.
[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmcrate, expected cfm. This could be a intended override, but in most cases indicates a broken mod.
[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmlightswitch, expected cfm. This could be a intended override, but in most cases indicates a broken mod.
[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmceilingfan, expected cfm. This could be a intended override, but in most cases indicates a broken mod.
[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmdeskcabinet, expected cfm. This could be a intended override, but in most cases indicates a broken mod.
[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmmodernslidingdoor, expected cfm. This could be a intended override, but in most cases indicates a broken mod.
[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmdigitalclock, expected cfm. This could be a intended override, but in most cases indicates a broken mod.
[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmtv, expected cfm. This could be a intended override, but in most cases indicates a broken mod.
[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmkitchencounter, expected cfm. This could be a intended override, but in most cases indicates a broken mod.
[13:22:15] [main/WARN] [FML]: Potentially Dangerous alternative prefix minecraft for name cfmkitchencounterdrawer, expected cfm. This could be a intended override, but in most cases indicates a broken mod.

Maybe JEI bugs, i dunno:
[13:22:33] [main/ERROR] [jei]: Found empty subBlock of Block{cfm:curtains_open}
[13:22:33] [main/ERROR] [jei]: Found empty subBlock of Block{cfm:curtains_open}
[13:22:33] [main/ERROR] [jei]: Found empty subBlock of Block{cfm:curtains_open}
[13:22:33] [main/ERROR] [jei]: Found empty subBlock of Block{cfm:curtains_open}
[13:22:33] [main/ERROR] [jei]: Found empty subBlock of Block{cfm:curtains_open}
[13:22:33] [main/ERROR] [jei]: Found empty subBlock of Block{cfm:curtains_open}
[13:22:33] [main/ERROR] [jei]: Found empty subBlock of Block{cfm:curtains_open}
[13:22:33] [main/ERROR] [jei]: Found empty subBlock of Block{cfm:curtains_open}
[13:22:33] [main/ERROR] [jei]: Found empty subBlock of Block{cfm:curtains_open}
[13:22:33] [main/ERROR] [jei]: Found empty subBlock of Block{cfm:curtains_open}
[13:22:33] [main/ERROR] [jei]: Found empty subBlock of Block{cfm:curtains_open}
[13:22:33] [main/ERROR] [jei]: Found empty subBlock of Block{cfm:curtains_open}
[13:22:33] [main/ERROR] [jei]: Found empty subBlock of Block{cfm:curtains_open}
[13:22:33] [main/ERROR] [jei]: Found empty subBlock of Block{cfm:curtains_open}
[13:22:33] [main/ERROR] [jei]: Found empty subBlock of Block{cfm:curtains_open}
[13:22:33] [main/ERROR] [jei]: Found empty subBlock of Block{cfm:curtains_open}

I will keep this issue open as a reminder for me.

Not a lot I can do unfortunately. I wrote poor code a few years ago and if I was to fix this issue, all data for my tile entities will be lost. I can guarantee in the 1.13 update this will be fixed though.