I've a weird glitch in Photo when I try to copy something selected with the Selection Brush Tool. Everytime when the selected image is copied and moved to another area it leaves "ghost pixels" and the selection is also losing pixels everytime it's copied.
I understand this when the selection is not perfect so it leaves behind some unselected pixels, but why does it happen every time? I've never seen anything like this in Photoshop.
The problem is visualised in 0:30 of the attached clip: