Your garage door is sitting crooked, meaning one side lower than other when closed or open, due to uneven tension, track, or cable issues that prevent door from hanging level. The most common cause is broken torsion spring on one side of two-spring system, as when one spring breaks, door loses half its counterbalance and one side sags, making door look crooked and heavy, requiring spring replacement costing 300 to 600 dollars for pair. Broken or frayed cable that has snapped or come off drum on one side causes that side to drop and door to be crooked, as cables lift door evenly. Cable off drum due to door being operated manually unevenly after pulling emergency release also causes crooked. Worn or damaged rollers on one side that have popped out of track cause that side to sit lower. Bent vertical tracks from car impact cause door to be crooked as rollers bind on one side. Loose track mounting bolts on one side allow track to shift and door to tilt. Extension springs where one side stretched more than other cause uneven lifting. Door panels themselves may be bent from impact causing crooked appearance. Unbalanced door due to incorrect spring tension also causes crooked. To diagnose, visually check springs for gap, check cables for equal tension and proper winding on drums, check tracks for plumb with level, and check rollers in tracks. Do not operate crooked door as it can go further off track, and call professional for realignment costing 125 to 300 dollars or spring cable repair.
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