firstaid-1.9.8.jar
&
playerex-1.1.8-1.16.5.jar

MC Ver 1.16.5
Forge Ver 36.2.34 (even tried latest .39)

A GUI bug when setting First Aid to show normal MC hearts as health bar it still shows as red bar for health and percentage as armor. ( Yes I changed it right in configs cause it shows normal mc health bar with out PlayerEx mod)

Idk if it is on your end or theirs

OKAY MY APPOLOGIES

TURNS OUT PLAYEREX HAS A CUSTOM GUI!! >_<