This is not something I have experience with, so I can offer some 'informed' speculation, but no definite answers.
I've learned the hard way -- many times -- NOT to assume that the manufacturer supplied the 'right stuff'. So . . . I'd recommend measuring the sections and making sure that they add up to the perimeter or length they should. For example, on a 36' long side, with (8) 4' sections, if each section is 1/4" too long . . . you'll end up with 2" extra!
Once you've verified the bits and pieces, check and make sure your section to section connections are correct. Again, it only takes 1/4" extra, per section, to create the problem you're having.
If you find no errors there, meticulously measure the top perimeter of the wall. Then Tuesday (since Monday is Memorial Day), call the manufacturer and ask them, after giving them the info you have.
Hope this helps!
PS. Just had a thought -- if the panel flanges are 'bulged' or out of 'square' themselves a bit, perhaps due to aging or floppy molds at the manufacturers, that could also cause a problem like yours.
Also, depending on the design of the coping and track, it's possible that 2" extra is not a problem.
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