OMG, not the only one. Look at this post I wrote on Reddit about this problem: https://www.reddit.com/r/samsunggalaxy/comments/me8qo8/problem_with_gallery_app_and_photo_creation_d...
One user gave me this tip: " Open Gallery > Tap Menu bottom right 3 lines > Settings > About Gallery > Tap on the "Version number" a few times until Labs is enabled. Back to Settings > scroll to bottom for Labs > Scroll to bottom for Data/time fix", but photos without metadata cannot be automatically fixed (like the photos they send me via WhatsApp)
It seems to happen with pictures without metadata... but in previous Android, when you move files around it didn't change the "date" (which is the Creation date).
This same issue happens when you edit photos in some apps other than Samsung Gallery. For example if you take a new photo then edit it in Google Photos app, the date EXIF info gets removed. The phone and Samsung Gallery then show the photos as taken in 1970 so they appear right at the bottom of the gallery.
Samsung will just say it's an issue with the Google Photos app (or other 3rd party app). But it only started happening after Android 11/OneUI 3.0 so I don't buy that excuse.
I found this app that can help fix this issue, until Samsung solves it. https://play.google.com/store/apps/details?id=com.panaustik.syncimagetime&hl=en&gl=US
You have to pay for using, but it is a good app!