I just took a look at my host stats and found that several hosts are duplicated in my host stats. They have different scores, but they are really the same stats with a different host ID. And for a couple of them, those hosts are long retired. How do I correct this?

I had the same problem. If I remember correctly it helped to merge the hosts in the various projects. I did this manually for every project. After 2 or 3 days the number of my boxes dropped.

I don't know, if there is a faster way to do this (for examples via the accound manager) and what to do in the case of retired projects...

I was actually thinking the same thing last night after I posted. It's a bit of a hassle, but fortunately I'm picky about my projects so it might not be too bad.

Oops. It should not post so early in the morning I meant 'account manager'