This is an FYI since I was able to fix it myself. At some point, one of my cards (Origin Dialga) glitched to where it was showing as unowned on the Collection page but owned on the Overview page. When downloading the CSV, it appears that the system had me as having -1 of the card.
Low priority since it’s easy for the user to fix (edit the CSV) but there should probably be either some updated conditionals or added constraints.
It happened to me too to find a card with a value of -1. Maybe it’s enough to put a limit that prevents the “NumberOwned” value from being less than 0
Thats interesting, there are checks in place to make sure it doesn’t get below 0. I’m curious how you got it like that…
I wish I could tell you lol.
I reckon it might’ve been a combination of issues. Maybe the “lag” with Collection combined with me misclicking and correcting Dialga’s card count? IDK