How can it Happen?
Here is one possible answer...
The Models.lst file has a place holder for the 3K cards.
Since there are NO 3K cards released yet, you Shouldn't see any..
but if you have 3K selected as your Default Download
The Downloader could, set this place holder
Even though the Card Is not 3K, it accidentally Got or Gets marked as 3K in the Modles.lst file.
The GUI is already Designed to handle that place holder..
So the GUI shows you have some 3K cards, when you Really Don't..
Doing a Rebuild all, will re-inventory all of your cards and correct the mistake.