[BUG] Mobs have more life than they should have

Summary

Very rarely do mob spawners spawn have more life than they should have. Example: in the thread I have 2000, it actually becomes 2005 and with a regeneration skill it keeps going up a lot more. This is very noticeable when using the boss bar

Steps to reproduce

I don't know the way to reproduce, but I think it is enough to put a spawner and try until the bug comes out. Since it is very rare it can take a long time

Current behavior

Mob have more life

Intended correct behavior

Mob spawned with correct life

FILE: https://pastebin.com/8P0APfgK this is the mob. and this is the spawner https://pastebin.com/D7TKKrXr