A: This slight curvature is not uncommon for new cards fresh off the rollers from the printer. It typically goes away with use, and should not interfere with shuffling, but if it’s bothering you, you can take the cards in small stacks of 10-15 cards and bend them gently in the opposite direction to correct.

This should not affect the playability of the deck in any way, in fact it’s actually quite difficult to pick perfectly flat cards up off a table, so the slight bend is less of a disadvantage than you might think.