Whenever I search for my username I find several suggestions. One of them covers most of the projects I'm on, but the other results have only one or two projects. How can I combine them all? I use the same mail and password on all of them!

Try searching for Arnstein and you will see what I mean

Because each name has a different CPID, so that could mean they all have different E-Mail Addresses too, if there all you then make sure they all have the same E-Mail Address & that should straighten them out into 1 ...

Is at least one of your computers connected to all of your projects? It doesn't have to crunch for all of them but must connect to the server from time to time. See also this FAQ entry.

Gruß,
Gundolf

I'm logged in on Boincstats on all 3 computers running my projects, but I don't have one computer that run all projects! Do I have to do that to get all into one account?

Yes.

Did you read the FAQ I linked to in my previous message? There it's explained.

Gruß,
Gundolf