Please have a look here:
http://www.boincstats.com/search/all_projects.php?teamid=38cd07ec4ad56cd5a4a59be152e4360c

If you click the member list of this team, in SETI@home stats I'm listed, in BOINC combined stats I'm not.
Another thing I just noticed after registering here: In my project list on the left, there's only rosetta@home listed, not SETI@home.

Any idea what's wrong here?

For your first problem: I think that you must be part of the desired team on all projects you participate in, in order to see yourself in the combined team list. And in your case for rosetta you're member of another team ("Electronic Sports League (ESL)" )

For the second problem: You can choose which projects to see on the left menu on this page

Thanks for the answer, although, to be honest, it didn't help me much. I can't see the difference between my Rosetta@home team (Electronic Sports League), which shows me as a member on BOINC combined stats, and my SETI@home team (Star Trek Soldiers), which doesn't show me on BOINC combined...

And the "second problem" was probably not well enough explained by me. I ment the list of my own project (the projects I participate in). I can't find the list anymore though... But this was just another hint for me, that something's going wrong, anyway.

About the teams: the search function is your friend, and it will find this thread

About the project not being listed: plenty of suggestions about how to fix that in the BAM! sub forums.