Problems with the leather pieces are almost always a focus issue.
It's always important to make sure the top surface is as flat as possible. Sometimes they get warped a little bit in shipping or storage, so it's necessary to bend them a bit in the opposite direction to make a flat surface.
It's also possible that your Z axis needs re-calibrated, due to replacement of the focus sensor or other wear.
I've attached a PDF with the procedure for this, it should take only a few minutes to complete.
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