Ahh yes we have seen this before. For some reason the underlying asterisk instance in some cases removes the last digit from the register status screen.
So when VoXaLot trys to marry up the status information it does not match.
e.g. Register
123456789@provider.com => Asterisk Reports 12345678 provider.com Registered.
We are not sure why this occurs seems like a quirk in asterisk.