update like normal or just get the 'security'...ehh 4 whu

It would be better if you can please re-post with a screenshot, in order to understand the phenomenon better. Images/pictures speak louder than words. 

Please understand this is a public forum: While attaching a Screenshot, do not provide any personal credentials, such as Card detail, email id, apple id, IMEI number, Serial Number, Phone number, Order ID, if you are sharing a map ensure your location is not identifiable, etc.

I have iPhone 4S iOS 9.3.6, iPhone 6 iOS 12.5.5, iPhone SE iOS 15.1, iPhone 8 iOS 15.1 and an iPad Pro iPadOS 15.1 and iPhone 12 Pro iOS 15.1.1. Prior to that, I had iPhone 3GS, which I have stopped using because it is carrier-locked.

I have been updating all these devices whenever a new iOS are released. I have never encountered any issue whatsoever after any update