Hi Viking9,
I read it as the Islanders sometimes work in pairs.
I my own humble opinion I think there were two Islanders up today, one with a misscoded box, or the Islander has two transponders and one was misscoded.
From looking at mylog all the Islanders fall in the 43C38* range with the BBMF using 43C38F-43C398.
Do Islanders carry one transponder or two?
Cheers John