Bots?

It’s possible. Or people fast sniping. I’ve had cards disappear from my binder immediately

I would guess yes. When I was really grinding after Easter I had to verify a bunch of times on the app that I wasn’t a bot. They wouldn’t be policing it if it didn’t exist.

I see it a lot with power ups - if you post well below market price they just disappear out of your binder sometimes.