I've gotten a couple of stamps like that - bare rubber, and the "cracks" were only on the back - no evidence of them on the front of the stamps.
I don't think they were actually cracks in the rubber, though. It looked more to me like the rubber sheet maybe creased when it was pressed into the mold. Maybe that's what SU meant when they told the OP that the cracks happen as part of the creation process.
For mine, they stamped fine after being mounted on EZ Mount, so I didn't worry about it. Actually, I had a couple of wood-mount stamps that I unmounted down to bare rubber, and those had the same "cracks" on them - if I hadn't unmounted them, I never would have known.
__________________ ~~Cheryl, with a "C"
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