A small but serious bug was affecting the N Masters Game Card Generators after the recent server upgrade. Whenever you tried to update a card through any way or if you were trying to create a new one, you would end up receiving one that is completely blank in the text data.
The bug is now fixed and all three Card Generators should work correctly. If your card is currently glitched, you can easily fix it by leveling it up or by editing it, even if you leave all your data the same way.
Thanks to wildgoosespeeder for reporting this bug.