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This happens with wood if you don't follow the golden veneering rule; "do the same to the front that you do to the back". I'm surprised that it happens to styrene though. I built a cab of styrene, but the difference was I did it in 3 layers so that the front and back looked pretty much the same. It wasn't to prevent warpage because I thought plastic was too stable, but I imagine that it might be the glue that is contracting, so if you use 3 layers they should cancel out.
At least, thats my theory
 

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I would speculate that the styrene is not warping, rather the glue is shrinking between the two pieces and causing them to bow as a result.
 
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