Bridged users are a type of user that is created via the Jive Bridging capabilities. An older piece of technology that allowed you to connect two different Jive communities. Are you using the Bridged Community feature?
If not, then I would file a Support ticket, because that is the only thing I know of that would result in a user being defined as type "Bridged". For users that are defined via the Jive Admin Console, the type should be standard. If you are using external authentication means, like LDAP/SAML etc... then the "Federated" flag would be true.
Hope that helps.
Thanks! That helps.