The only reason it would warp is if there was an uneven heat across the griddle. This can happen a few different ways. One way would be to heat the griddle up to quickly, by turning the burners on above medium heat setting. We do suggest using the griddles on medium heat or lower and having all the burners on at the same time, and not only heating part of the griddle. Also, if your griddle is already hot and you place frozen or cold food only on one side of the griddle, it will shock the steel causing warping.