I have a Sharepoint 2013 server set up to use FBA through active directory. I've set up the claims providers following microsofts guidelines: http://technet.microsoft.com/en-us/library/ee806890.aspx#proc3
On a site collection using Sharepoint 2013 expierence, the people picker works correctly. AD accounts show up under the Active Directory catagory, and Forms Authentication accounts show up under forms auth.
However on sites running Sharepoint 2010 compatability, both accounts will show up under "organizations".
I am guessing that the configuration is a little different for 2010 compatibility, however I have been unsuccessful in my search for any documentation, any ideas?