So I was trying to change some settings in-game and this thing was always happening. I wanted to change the intensity of the heartbeat visual affect while keeping the red aura but this kept happening. I don't know if this is the mod or another thing messing with it. I also tried setting outside the game and restarting it, but no luck.

Here is a video (file too big sorry)

I'll also include the log file if that helps.
latest.log

Does deleting your config file help (also make sure to shutdown minecraft first)? Sorry for not responding earlier.

Will close this due to inactivity.