Ever check the press surface with a straight edge before you use it? A lot of that cheap cast iron is warped straight out of the box. I put a piece of thick acrylic between the work and the press now as a buffer.
Ugh, that's such a good point and a total pain. I learned the hard way after ruining a few projects. The acrylic buffer is a smart fix, way easier than trying to return the whole press. Makes you wonder why they can't just make them flat to begin with.