If you suspect one panel is curving, put a straight edge up against it to test. I'm still with the people who suggest leaning. Do you have a t-square, or a framer's square? You can also measure the corners on the diagonal. If the structure has lost its ninety degree angles, the measurements will differ.
When Melamine warps, it tends to look swollen, and the seams split. It maybe that there is something going on from the inside, a join that wasn't sealed, and got wet?
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