I got this in Google Analytics:
A significant portion of referral traffic to property example.com is from the following hostnames, which may be self-referrals:
Self-referrals are referrals from pages within your own domains. Self-referrals can obscure the actual sources of traffic to which conversions and other engagement on your site should be attributed. As a result, your referral metrics could be inaccurate. Further, self-referrals could be indicative of improperly-configured cross-domain tagging. Your users could be generating a session per domain, which would artificially inflate session counts.
There are multiple different Analytics misconfigurations that can cause self-referrals. Users navigating from an untagged page on your site to a tagged page can appear as self-referrals. Users navigating from one subdomain on your site to another subdomain that uses a different cookie domain can appear as self-referrals. If you track multiple domains in one web property, users navigating across multiple domains on your site without linker parameters set up to transfer cookie information properly can appear as self-referrals.
To avoid self-referrals, ensure all pages on your site are correctly tagged with the Analytics tracking code, make sure that cross-domain tracking is configured correctly on all your pages, and check your cookie domain settings in your tracking code to be sure that all subdomains in a domain are using the same cookie domain.
Has Google lost it's ever loving mind??
What is the status of Google's action on Ghost Referrals?
This has gotten more than old!!