plutuplutu edit: they duplicate in Nemo?
2nd edit: if by Files you mean Nautilus I saw this exact insane behavior all the time in Nautilus and can confirm. Like 1.5 years ago I could confirm this exact behavior.
I stopped using nautilus before solus stopped using nautilus, and it was my understanding that nautilus was removed from Gnome (budgie for sure) a year of more ago?
Guess not.