items randomly sliding

so i was just playing rog to see if there were any hamlet issues w/ it (i.e content not supposed to be there, w/e) and i came into a graveyard. i saw some gold literally just sliding forwards, like in shipwrecked when an item is pushed by a gust of wind, but it's weird because there's no gust of wind, no anything, the item is just moving. idk but it's p weird