Yeah you have to go back to profile page and sync them, there is no other way, a simple sync link on the create board page or the pin setting page would be a great solution here.
I have the same problem now, none of the boards sync when you delete them from the accounts or when you add new ones, only restarting MP gives a solution.
I did, it does sync the figures on the front but i have no more boards to create so i can’t say anything on that as i already worked it with a restart.