Please be sure everything is correct and complete. I've come across sets that have no card size listed and the sets are locked. If you see 2 1/2" x 3 1/2" and it's gray font, that's a field default. There is no card size until you type one in. In the example below you'll see in the set Overview (on left) Size: is blank, still needing an edit. The size of these cards are 3-3/8" x 5". Card size is also important for correct Front/Back image display.
Someday my cards may double in value and then be worth half of what I paid for them.