Help !! My iPhone 13 Battery Performance Drops to 99 !!

My iphone 13 with 64 charging cycles dropped the max performance ot 99% is this normal Im using my iphone around 2 months now. I tried the very best keeping my charges around 20% - 80% i kinda charged it to 100% 6-8 times. I usually turn on low power mode and play among us and f1 clash game and my screen on time is around 5-6 hours. Just out of Battery OCD should i be worried about this i expect my battery to work well for Atleast 2 years without any reduction in the hours it can last. Help me understand if i have to be concerned.