The short answer
Uneven Travel Means The Lifting System Needs Attention
Both sides of a sectional door should rise and lower together. Lift cables wrap around drums and transfer spring force to the bottom of the door. If a cable frays, breaks, becomes slack or leaves its drum, one side may lose support.
A bent track, displaced roller, damaged section or spring problem can create a similar symptom. The angle alone does not prove which component failed, so forcing the door level is unsafe.

