I am thinking the same thing as others have said. It is a chemical reaction cause by something in the blue liner. Remember a couple of years ago when people were getting burns on their feet from soft rubber sandals that Wal-Mart was selling? It turned out it was some chemical used in making the rubber and too much had been left in the finished product.
snopes.com: Wal-Mart Flip-Flops Cause Chemical Burns
I made up liners for my tool box drawers out of pieces of rubber belting used in conveyor systems. One of the suppliers I deal with a lot sells conveyor belt supplies and has crews that repair the conveyors. He sold me several end pieces off the roles of belt material that were too short to keep around. Basically the scrap piece at the end of a roll of the belting. I comes in several different sizes and types, but I like the stuff that is thick enough that it doesn't bunch up at the back of the drawers that have heavy stuff in them.
There ought to be something like that around Houston I would think. If you want I'll send you a piece of the stuff I used so you can see if you like it.