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Perhaps thermal differences are to blame? Certain plastics are known to exhibit expansion and contraction under different temperate circumstances. In the pits or at any given working space, the temperature may be considerably colder than on stage at a competition, under bright lights and constant use.
I have noticed, in working with bins at our workspace, they are much more rigid than the ones I handled at UTC. Again, maybe it's temperature differences? It was much colder at our workspace than it was onstage.
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