After logging in, my deck lists seem to have been replaced with hundreds of empty decks with names that suggest they came from another user's data.
Refreshing didn't fix anything, and these decks seem to persist between sessions, as I made a new deck to test and that saved as well, and tried logging in on different devices.
Decks I've exported as download links, such as the one in the link below, don't seem to have been affected by this, but obviously I can't access or edit them now.
https://www.duelingbook.com/deck?id=4151433
Other things tied to my login, such as my profile and custom cards, don't seem to be affected.
I think something's gone very wrong on the backend somehow. Any ideas on restoring my original set of decks, other than deleting all these dummy decks and starting fresh?