My stats have remained consistent, and there's been no update messing things up that I'm aware of. I keep a close eye on Different Cards Owned, and it's remained unchanged for me.
I'd be wigging out too if I knew for sure that my collection numbers changed by 5,000. On a monthly basis, I take a screenshot with my iPad just in case something like this, or other account compromise should happen.
I wish I could be more helpful. I can't help wondering if some associated database has become corrupted. They track these things at the server level, I know. It might be a temporary server glitch. But I'd still do a complete uninstall/reinstall to see if that cleared the problem. If that didn't do it, your only recourse is to gather as much info as you can and submit a Support Ticket.
Edited by RobRatt, 03 July 2018 - 06:18 AM.