The other day I opened my Trello board to find a column missing and the titles of my other columns moved around. Also cards had moved around to different columns. I'm still having recurring cards pop up in the wrong column. To move a card to a different column, I have to manually drag it to the new column instead of using the Move button. When I press the Move button it may or may not show the column I want to move to.
I think my problems began the day the servers went down.