That's not exclusive to Beheringer in the bargain department. Even so-called quality brand has issues when on display in the stores. Nord for instance has a super good reputation but their products are in fact quite fragile. I've seen more than one broken on display model. And that stuff isn't cheap at all. Things I've seen: virtual drawbars breaking on their organ model, keyboard issues (dead notes, inconsistent volume, knobs missing / broken off. Otoh; brands like Yamaha and Korg seem to hold up quite well at in-store displays.

Even so, most electronic music gear sold in quantity isn't nearly the quality of stuff aimed at the touring musician, and for the price it really couldn't be.