When I installed HEI, Mod Name Tooltip, and Universal Tweaks, items in JEI have 2 line of mod name:

If I remove Mod Name Tooltip or Universal Tweaks, the bug disappears:

Items in inventory don't have this bug:

Why do you need Mod Name Tooltip when you have Had Enough Items installed?

It's already in the modpack. Also, HEI doesn't show mod name of the item is in inventory

Granted. Well, the tweak you want to disable is Faster Background Startup under Bugfixes: Misc.

Does it have any effect on the performance? By the way, thank you very much

It‘s to fix an edge case when loading large modpacks in the background, negligible in this case.

So, modpack like multiblock madness will not be affected?