all of a sudden (main) Regeneration script wont work??

i was scripting my game when i ran into a proplem that is kinda weird

i was fixing my Health GUi when this proplem happened

Proplem: When you Test in studio and lower health in humanoid it regenerates health from its own script

BUT NOOOOOOOOOOOOO

all of a sudden i doesnt in servers?

is it cuz FE? or EXpermental mode off?

if you dont understand what i am saying its the Regeneration script when the player spawns ingame in my game it doesnt work even tho i checked if its disabled or no...