Once downloaded, I decided to move a sub-folder of a torrent, which I did via Tixati, and then delete some of its files because I actually didn't need them. I did a force-check on the moved sub-folder and now Tixati shows a small positive percentage, like 1-5%, for the files I deleted instead of 0%. Does anyone know why this happens? The torrent says Complete - Offline btw.

are those pieces beginning and/or end pieces?
they are probably being stored in the 'incomplete pieces' folder.

OP here. It appears so, yes. So it's kinda normal for a selective download, if I understand correctly.