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Well, maybe the stand was poor quality and failed. Maybe it was not properly installed and tilted. Maybe the car was not level and jumped out of the jack. Maybe the locking handle was not fully at rest and the top stand collapsed. Maybe it was installed under a non-structural part of the car and the car itself bent out of the stand. No details, hard to know.
Bottom line, this happens very rarely, and outside of operator error it's even more rare. Unlike hydraulic failure of jacks which are very common and to be expected, this is a freak event.
Careful with some brands of ramps. They are known to collapse too, quite often, at that. Do not trust cinder blocks or wood stacks either.
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