Mailboxes order keeps changing

I have about a dozen different email accounts and, ever since upgrading to iOS 7, their order in Mail keeps changing.

I'll hit edit and rearrange them to my preference, but an hour or two later they'll move to something else.

The new order doesn't seem to be based on which received the newest email or was used more recently, but completely random.

Is anyone else having this issue or know of a way to get the order to remain constant?