Photographs Not sorting Correctly

I've checked a file 20171212_105605.jpg, shown in the Gallery in the day "18 Sep 2018". It's Date Taken/Authored date is 12/12/2017 10:56. The date Created and Date Modified are both listed as 07/12/2018 18:42 which reflects the date I moved them from my previous phone onto this one.

Hmm, that's really all over the place.:-\ You may have to try a different gallery app, like Piktures. Did you also try Google Photos?
 
I doubt that, had it been the transfer then it would have shown itself a long time ago. As I said although I can't be certain that it was the update, I am certain that this wasn't happing a month or so ago.
Ok gotcha, I've never did that way , always smart switch or restore from cloud . So something happened with transfer maybe we get someone here to help out what could be the issue.
 
Deleting thumbnails would only delete that thumbnail, but the system would create a new thumbnail for the main picture file when it's needed.
 
I don't think it hurts to try, but I also don't think it'll help with the sorting, to be honest.