When I unequip armor with health boost I die instantly

Steps to reproduce the behavior:
1.- Equip the armor with Health Boost
2.- Unequip the armor

Expected behavior:
I have tested if the error occurs without the first aid mod, and I saw that when I removed the armor with health boost it left me with up to half a heart or one heart of life, that with the first aid mod is an instakill, and that is why this happens with that mod