Why does the AI always end up with 1-3℅ health

Big_420

I don't know if anyone else is having this issue but I've been noticing that a good percentage of the time no matter what is going on my opponents seem to always end with 1-3% health left. Example I was using a 4* r5 sig 99 AA I don't remember who my opponent was but he had 2 bleed 1 poison and 1 neurotoxin everything stopped he was at 1℅ became the baddest champ in the game and beat me. I'm just wondering if anyone else has noticed this it's happening more and more. This was this morning.