I once changed the thumbnail of my beat map to a black wallpaper so i can map better and i also submitted it with the black wallpaper, now i have overwritten my song with a new one and changed the thumbnail of my beat map but somehow the thumbnail doesn't show the new one but it shows the old one(the new thumbnail is in the back of the selection screen and the old one is in the little screen besides the name), i tried deleting the thumbnail in data > bt but every time i delete the thumbnail it just makes a new one and it keeps on bugging me for weeks now, i need help i really want to go back to mapping ^-^