I dont know what client you are using, but I suggest you watch the server output, rather than the numbers displayed by your interface for dice in the tray. If you had rolled numbers allowing entry, FIBS would have entered your checkers. It NEVER makes mistakes like that, it is software, some 20 years old, and well tested. Your interface however is something different.
Be assured, the reason you did not reenter, is because you did not roll numbers which would allow that.