Direct answer: When one side of a garage door sits higher than the other, the usual causes are a roller out of the track, a bent hinge, loose track mounting, or a cable problem. The safe homeowner checks are visual and low-force. Do not try to re-tension springs or reset cables yourself.
Most likely: Most often, the door is cocked because one side is not rolling the same as the other. A stuck roller, worn garage door hinge, or shifted track can hold one side up and make the bottom edge look slanted.
First figure out whether the door is only crooked when moving, or whether it rests crooked when fully closed. That split tells you a lot. If the door is visibly hanging by one cable, stop there and call for service. Reality check: a garage door can look just a little off and still be one bad move away from a jam. Common wrong move: people keep hitting the opener, which usually twists the door harder and damages rollers, hinges, or sections.
Don’t start with: Do not start by loosening cable drums, touching torsion springs, or forcing the opener to drag the door straight.
The bottom seal touches the floor on one side first, or one bottom corner stays up while the other side is down.
Start here: Start with a full visual check of both bottom rollers, lower hinges, and both lift cables before moving the door again.
The door starts level, then one side lags or jumps as it travels.
Start here: Disconnect the opener and move the door by hand a little at a time to find the exact height where one side binds.
A cable may be slack, off the drum, or hanging differently from the other side.
Start here: Stop using the door immediately. This is no longer a simple roller or hinge check.
The twist seems to start around one hinge line or one roller stem, not across the whole door.
Start here: Inspect the hinges and rollers on that side first, especially where the lean begins.
One side can hang up while the other keeps moving, which makes the door rack sideways.
Quick check: With the opener disconnected, look for a roller riding on the track edge, a flat-spotted roller, or scrape marks where the wheel has been dragging.
A hinge that is cracked, twisted, or wallowed out can shift one panel edge and throw that side out of line.
Quick check: Look where the crooked section starts. Compare hinge shape and screw tightness side to side.
If one vertical or curved track has moved, that side of the door will not travel the same path as the other.
Quick check: Sight down both tracks. Look for a gap change, bent bracket, fresh rub marks, or bolts that have backed off.
A stretched, frayed, slack, or off-drum cable will let one side drop or rise unevenly.
Quick check: From a safe distance, compare both cables. If one is loose, frayed, or wrapped wrong, stop and do not run the door.
You want to separate safe homeowner checks from tension-loaded hardware right away.
Next move: If both cables look normal and the problem appears to be in the rollers, hinges, or track, you can keep checking safely. If one cable is loose, off the drum, or frayed, stop using the door and arrange service.
What to conclude: A cable issue points to tension hardware, not a simple alignment tweak.
The high side is often the side that is hanging up, not the side that looks low.
Next move: If you find one bad hinge or one roller that is clearly the trouble spot, that is your most likely repair path. If the rollers and hinges look even, move on to the track alignment check.
What to conclude: A localized lean that starts at one panel joint usually comes from that hinge-and-roller area.
A track that has moved even a little can make one side travel tighter than the other.
Next move: If you find a loose bracket or minor fastener looseness with no cable issue, you may be able to snug hardware and recheck door travel carefully. If the track is bent, twisted, or pulled out of plane, stop before trying to bend it back with the door loaded.
Once the fault is visible, the safe fixes are usually limited to worn rollers, damaged hinges, or minor loose hardware.
Next move: If the door now moves evenly by hand and the bottom edge stays level, reconnect the opener and test it. If the door still racks sideways after a roller or hinge repair, the remaining cause is often track alignment or cable tension that needs service.
A garage door should feel balanced and track straight before the opener is asked to pull it.
A good result: If the door tracks straight by hand and under opener power, the repair is holding.
If not: If one side still lags, drops, or climbs, stop using the opener before the door binds in the track or throws a cable.
What to conclude: A smooth hand test is the best proof that the door is no longer fighting itself.
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Not until you know why. If the problem is only a worn roller or bent hinge, continued use can turn a small repair into a bent track or cable issue. If a cable is loose, stop using it immediately.
No. A crooked door is often caused by a bad roller, bent hinge, or shifted track. But if one cable is slack or the door suddenly got heavy, a spring or cable problem moves higher on the list and that is not a basic DIY repair.
Usually the high side is the side hanging up. That side may have the stuck roller, bent hinge, or tight track. The low side can simply be the side that kept moving.
Usually no. If the real problem is a bad roller, hinge, or cable, forcing the track to match the crooked door just creates a second problem. Find the part that is hanging up first.
No. Tracks should be clean, not greasy. Lubrication can help some roller bearings or hinge pivot points if the product is appropriate for garage door hardware, but grease in the track will not fix a door that is out of square.
Any time the symptom involves a loose cable, bottom bracket, spring, drum, or a door stuck crooked while open. Those parts store enough force to cause serious injury.