Hello, I’m having an issue with my health and armor system. I normally don’t have this issue, but the thing broke when I tried to change the armor and health values. I changed them back and now I’m still getting the same issue. Health dips into the negative value when the player’s health and armor is completely gone. 
You account for armor being <0 and then set it to 0 everytime damage is taken so it doesnt go negative. But in this BP you showed you dont account for health <=0. So if you dont account for that somewere else when damage is taken it still adds the negative armor value so the health value is negative. You can just add a branch and if health <=0 you can trigger a death event.