Should be easier

I have lots of photos and I should click every one to trash them. In adittion, I have to click in the box… Make it more difficult. Why not I click in the area of the photo?
For my surprise, after I finished to trash some photos they appeared again. Is it normal? Or, would be others pictures in different folders?
I think that should works like that:
The group of photos appears and I choose the older or the recent date founded and the program keeps just one photo of the indicated day and delete others. In case of many duplicates photos it would be faster.
I’m afraid to click in Auto Mark and delete all the pictures at the same time.
Anyway the app is very useful and good.

Angela Cunha about Duplicate Photos Fixer Pro, v1.8.1