Ceramic stones not straight?

Hi, don’t know if the post is in the right place.

My ceramics are not straight, they are also thinner then my other stones and straps with about 2mm. This can’t be right?

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<p style=“text-align: left;”>Yep, they are 27mm thick, surface to surface. I can’t polish the edge when they are bent like these. I’ll send them an email. ?</p>