floor and door do not like eachother,,

came across this today. 

the two images are in the same house, on two different sides of the wall. for some reason, as shown, only on one side, the door doesn't appear to be on the ground. (this occurs with all doors.) it won't let me drag it down or anything,, i was messing with the second floor and accidentally messed with the door somehow. anyone know what's wrong?