Hey!
I know 1.7.10 is a old MC version and still not be update. On the other side i don't want to play with TR [1.8+]. So, i have a question. How i can fix this issue for 1.7.10?

Minecraft Forge 10.13.4.1614
RebornCore-1.1.0.15-universal
TechReborn-1.7.10-0.7.20.1118-universal

Few things to try, if you have any graphics mods like optifine, or fastcraft, try removing them.

Try hiding nei? does that help?

Last thing to do, the machines should still work just fine, you might have to put up with it. I wont be fixing this for 1.7 as it isnt a major issue.

Unfortunately, none of the tips did not help to solve the problem.
Thanks anyway!