Why does my iPhone 15 Pro show more Screen Time than I actually use?

I recently purchased the iPhone 15 pro last month, previously having the iPhone XR. Why is my screen time showing between 4-5 hours per day when I'm only using it maybe 45 minutes to an hour each day. How do I fix this? Is it because the screen never goes completely dark? Thanks for any help.

[Re-Titled by Moderator]