battery percentage stuck for a while after taking off charger

So I recently got a brand new iPhone 11 running iOS 13.3 and well yesterday I took it off the charger at 100% and it stayed at 100% for 33 minutes. Today i took it off the charger at 95% and it stayed at 95% for 30 minutes then I restarted it and it jumped up to 96% for a minute and then stayed at 95% for 10 more minutes. After that battery starts to go down as usual but I am just wondering if this is normal and why it’s happening. I am using the standard 5W charger.