iPhone SE (2020) Different screens when people call?

[Pokeman]

So I noticed that I get 2 different screens when someone calls. One is a slider and the other has an answer and decline button. I looked it up and found out that its for when the phone is locked or unlocked. However, mine doesn't appear to follow this and appears to be random. I have my phone set to lock after the screen times out after a minute or if I hit the screen button to turn it off. However, whenever my phone is locked and hasn't been touched in a couple hours, I still get the accept decline buttons, the screen that it should be when unlocked, but I know it was locked. The only time its unlocked is when I'm using it, and then calls come in the form of a banner. Does it use the light sensor any when it makes judgement? Like if it's in your pocket it detects darkness whereas if I have it on a table, it detects light and shows the one for the unlocked? Like I say, I know for a fact if my screen is off, it's locked, so why would it then show the incoming call screen for it as if it was unlocked?

 

[BugeyeSTI]

I've had the random screens since iOS14. Not sure if it's a bug..