Manual garage door won't fully close
Clearly something is binding, catching or blocking the door sections or roller wheels in the tracks. It could be as simple as one of the track mounting bolts has come loose and is binding with the roller as it tries to go by.

It is also possible that the door is becoming wedged as it gets toward the lowest position. There may be a small diameter cable attached to the lower section of the door on each side that goes up toward the top and spools onto the spring assist lifter at the top. It is possible that one of these cables has broken, become detached or has doubled over itself in the spool mechanism. One or the other of these could cause the door to not be supported uniformly on each side or the cable not allowed to un-spool nicely on one side.