As Abbysgrammy says, it's perfectly normal. Often it's the die cutting into the plate, or sometimes the plate is being reflattened,when it's been used a lot.As long as the sandwiches used are never so thick you have to apply force to get them to go through, you're fine. Do remember to flip the top plate regularly, preferably every time you die cut, as that helps reduce warping, which will happen.
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