Really weird glitch I just found

Ok so here’s what happened
I lost with that square left > I quit the game before it got to the end screen > later I reopened the app > I placed that from the last game down on a full spot > the end screen started and I got an ad > restarted the app and went back in > started a new game > that same square was in the same place I placed it on the game I lost
Super weird looking bug, honestly pretty cool