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Some types of natural stone will tend to warp when they are subjected to moisture and then dries, and when they are subjected to high temperatures and then cool.

Expert AnswersMoisture ProblemsstoneWarpage
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I do not think it is possible for a porcelain tile to warp after it is installed. Ceramic or Porcelain tile only warp during the kiln firing process.

Ceramic and Porcelain TileWarpage
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