Edmonds skews older than the surrounding service area. The area overall built out mostly between the 1960s and early 2000s with a median around 1985, but Edmonds itself centers closer to 1973 - meaning more of its garage doors sit on hardware installed, or re-installed once, during an earlier generation of residential construction. Doors from that stretch often ran on narrower-gauge track with lighter steel rollers than what gets installed today, and the horizontal track brackets were frequently lag-bolted directly into door-jamb framing rather than into reinforced blocking.
Over decades, that framing moves - settles, dries, shrinks a hair each winter - and the bracket that was flush in 1973 is now fractions of an inch out of true. Add a cold, moderate climate that swings the wood jamb's moisture content season to season, and the track alignment that was fine in August can bind in January, pop a roller, and let the door walk off the rail on one side. It's rarely one dramatic event. It's usually a slow drift that ends the day someone backs a bumper into a slightly-off door and the whole thing jumps the track.