Trello certainly shouldn't be adding that many cards when you log in, so it sounds like there might be something else going on. The only bulk delete feature Trello has is manually, via the API: https://developers.trello.com/
If you can write in to us via https://trello.com/contact, we'd be happy to take a closer look at what you're describing and see what's happening!
So you’re using Trello at work, at home and to track your new DIY crafts. The family and co-workers are all on board and everything is organized, color coded and has a due date. But still, there’s so...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs