Hi CurioCT - long time no see around here.....
It does seem a bit of an odd one!
Did you try any of the big-guns partition management programs? I know they're sometimes a bit of an over-priced over-kill solution but they do prove useful sometimes.
I've never come across it before, so it's kinda hard to look into it without such a stick here....just corruption maybe? - maybe someone else has seen this odd formatting?
Sorry I can't offer any insight with it, but please post any further development with it. It'd be interesting to see