Optifine breaks mekanism items meaning they show up as broken tecture items. I have here some screenshots of the broken tecture items.
pupnewfster commented
Congratulations? What do you want us to do about it. Optifine is a closed source mod it isn't like we can submit a PR to fix them reverting a fix by forge pertaining to a bug that was in forge code (not even one that was in vanilla code)...