To align multiple CPIDs, firstly, make sure that you are using the same email address and username for every project.
Now go to your BOINCStats main account, and click on "edit account".
Then click renew CPID button (blue arrows).
This should align all CPIDs to your original CPID, although you may need to run at least 1 WU on any errant projects.
Be patient, as is may take several days for the changes to take effect, depending on the project.
See your BOINCStats/BAM account at:
http://boincstats.com/bam/account.php