No, in fact, I recorded the account amount on the 31st, before I stopped playing. So I'm sure there was no interest. And I'm pretty sure this has been going on for a while. It's just the first time I made the effort to keep track of it.
Try withdrawing some money. I'm not sure if it'll significantly affect your interest rate, but it could reset the pattern. That and make sure your mailbox is clear - but knowing CF mailboxes, it should stay clear
"Depart from evil, and do good; seek peace, and pursue it."