Endurence Charges Bug

I have a 14 second endurance charge in my armor and 5 endurance charge max. But for some odd reason, I can keep stacking endurance charges until the 4th one and then it resets to 1 instead of going to 5 endurance charges.

Get more charge duration or conflict the endurance charge generation up (down?) to 13 seconds. Server tick rate issue when things are happening within the same time frame, 14 seconds for you. Has worked this way since Eldritch influence was first added (maybe older, can't remember any consistent timed charge gain from before).

Your armour says you gain an endurance charge every 14 seconds. Your character sheet says you have a +40% duration modifier for endurance charges, which should make the total charge duration 14 seconds. Gaining a charge while you have one active resets the duration for all charges of that type. There might be some weird rounding error happening or something.

To test you could try increasing the charge duration a bit more to like 45%, or use a higher tier eldritch currency to get a better charge gain on your armour (gain charge every 13 second or lower - risky though).