So, I logged in yesterday morning and all the cards were there. No problem. Checked it in the app on my phone. Then, in the evening, I was looking again, and all the cards in a single column only had disappeared. The column is still there with the proper column heading, but 30 ish cards had vanished. I checked again on the computer and in other browsers and asked my staff if any of them could see the cards. No one can find them anywhere. I checked the history of the cards - they don't show up anywhere. There's no filter on and nothing else that I can determine would create this issue. ALL OTHER COLUMNS ARE FINE. It's just this single column. Any ideas what could be causing this highly specific glitch?