When I visit http://www.boincstats.com/stats/boinc_user_graph.php?pr=bo&id=b6e6a280cf6acf0cc3ea0528f3fbecb1 the following message shows up.
"User CPID doesn't exist in BOINC combined stats or doesn't have any credit."

It's been like for at least the past 3 days (I registered a long time ago, but just started using boincstats)

But that is not your CPID Here are your stats (you have two, because you have a split CPID. To see how to fix visit the F.A.Q.)
http://www.boincstats.com/stats/boinc_user_graph.php?pr=bo&id=1fd5e18e7fbdbff19924447fc3566c77
http://bg.boincstats.com/stats/boinc_user_graph.php?pr=bo&id=a18053542143fdc7741cdb224c43939d

Weird, how did you get that CPID? On my main account page it says CPID b6e6a280cf6acf0cc3ea0528f3fbecb1. And that's where the link goes when I click "My detailed stats"

I did a search for your name
As fro your main account page, try renewing your CPID from the Edit account page. Also if you do not use BAM! as an AMS I don't think that the CPID in the main account page and your real one(s) will ever line up.