If you are using another analytics-plugin and you get the referral data set wrong you can try and configure your Google Analytics solution to exclude the domains that is wrongfully set as referrals.
Identify the wrong traffic sources or domains.
Open the admin pages in your Google Analytics dashboard by clicking on the admin-link down in the left corner.
Choose <> Tracking Info under Property.
Open Referral Exclusion List and add the traffic sources or domains you which to exclude.