By chance, did you change your email address? If so, that can cause a split/second CPID. I'm having the same problem right now too. For me, it's not that big of a bother, as I'm only out about 12K creds.
One thing I noticed, and I'm not even going to say that it "could" be an issue, but I searched your name and found the two instances there, as you stated. The thing I found peculiar is that you have two hosts, both being active. I'm only running my one host, a Core2 Quad Q8400. But if BOTH hosts are under the same username, maybe that's what's causing the instance of a second CPID. I noted that BOTH instances have PG (PrimeGrid) listed, and the CPID is the same for both instances of Bill42. I also noted that it appears you started MilkyWay on 6/20. Something could have went "haywire" in the joining process.
In any event, seeing as how you posted your issue here, Willy may be able to help you get things worked out and everything back together. Willy is the master of BOINCstats and a great go-to-guy when things go astray.
Happy Crunching...