Yahoo Search Referrals not appearing in Referrer reports
We have an ancient VISTA rule which populates our Tracking Code report. It records plenty of referrals from Yahoo which appear as 'search.yahoo.com' in the Tracking Code report. However these do NOT appear in the Referring Domains report or other referrer reports.
For example, in August the Tracking Code report showed 4,000 click-throughs from search.yahoo.com, but the Referrers report only recorded 611 of those. The remaining 3,400 click-throughs weren't shown AT ALL in the referrers report, which implies they were seen as Internal Referrals. This is supported by our Marketing Channels report which showed over 2,000 visits in the Internal Referrals report which the Tracking Code report said came from 'search.yahoo.com'.
Has anyone else noticed this behaviour? Is our VISTA rule somehow hiding the true referrer? Maybe there's some kind of instant redirect or reload which the VISTA rule somehow ignores, but which stops the standard Referrer reports from seeing the initial yahoo.com referrer?
If you don't have the VISTA rule then possibly the only other way you'd know if you had the same issue would be by comparing reports from Yahoo with reports from Adobe.