I cant say i'm 100% sure what is causing this to happen, i'm using RPG-HUD in my custom modded pack that is currently for private use only. However, the pack itself contains 138 mods, including RPG-HUD and other mods child mods. Thus making it a medium sized pack. I'm not sure why, but this display issue is constant and i cant seem to figure out whats doing it? i tried disabling EVERY event i could to see if something was overriding it, but alas, nothing. As you can see in the top left (i'm using the modern layout) the health bar is like, phasing into the hunger? and i've no idea what is causing this to happen. I'f you're wondering why the compass looks weird its because i'm using the true font mod.

This issue is known. it's caused by mods like tinkers' or scaling health. Go to settings -> Health -> prevent event. If this doesn't fix it let me know. because it did for my tests.

Thank you so much for the quick reply, i was very eager to get this fixed because i really wanted it in the modpack. Turns out i had the wrong setting enabled so instead of having prevent event i had prevent render enabled. Again, thank you so much for the quick reply.