Your humidity level in the room is too low, happens here in Toronto all the time.
You can try spritzing the back of the prints with distilled water before they go in the press , this will help kind of like ironing shirts.
I see you are from VT which should have the same humidity problems we have here in Toronto.
Either raise the humidity in your mounting room or wait for spring when the humity outside climbs.

Quote Originally Posted by sepiareverb View Post
When I remove prints from the dry mount press I often have wrinkles at the short edges. At times they have been wrinkled enough to become pleats. Happens on 1620 and 2024 paper most often, but does happen on 1114 from time to time. Anyone know of the cause?