There seems to be some sort of health cap within the game?
I did some testing and it seems the game physically will not let you go any higher than a certain amount of hp (depending what items you have) once you take damage.

• The only fix is dying.

Wearing heart canisters w heart amulet (maxed)

• Max HP is 99, if you regenerate to 100 using golden apples it spams constant dmg to keep you at 99. Same with any other sort of regen (Food, Potions, Abilities)

Wearing Pleiadas Combat Maid armour

• Max HP is 48 however to game forces you to stay at 47. Same principals apply^

• Does not do dmg to armour

• No effect visible

Am I missing something?
The only thing I can think of perhaps causing it is, is the un-insulated copper cables. However those have since long gone but it more or less has the same effect.

Unsure, though un-insulated cables do damage you if you are near them if memory serves.

I've uploaded a video showing it in action. All with different health variables.
The sound on it got corrupted a bit, sorry for that.

https://youtu.be/Qf0bu6YRsHw

That is rather odd, unfortunately not quite sure what could be causing it and I also have been distracted so have not actually spent time working on the pack for quite a while and not sure when I will get a chance to release an update as I had started working on rewriting how parts of it works.