Thanks for your question. To give you feedback on your particular project, it would be helpful to have more information than you have provided.
There was another recent question about warped panels--have you seen it? Does anything in it seem like it could be the same issue that you are having? It's a pretty detail explanation including the materials that were used. viewtopic.php?f=14&t=4823
I hope we can help you with this, and we hope that the other recent thread includes helpful info.