iPhone 13 burn in fast

I've had my iPhone 13 for a little less than a month. I've noticed that after watching a movie or scrolling on TikTok for a while it leaves burn-in marks on my screen. (These burn-in marks are more prominent at first and fade away with time, but they never fully go away.) My phone is never usually above 50 percent brightness and I also am not on my phone all day. I want to know if anyone else is experiencing the same issue and knows what to do.