Garage door does not close flush along the top
The screw that holds the lift bar in place may be loose. It should be taut enough to allow the top of the door to hit tight up against the outside weather-stripping when the door closes and hits the floor to prevent drafts. If it is loose and wobbles around, tighten it enough to make it stable and not visibly loose, but not too tight that it becomes too rigid and inflexible.