I had the same issue for the last few days, and finally resolved it. I am also running Safari 9.1.3, and was experiencing the issue after visiting eBay. My first obvious approach was to reset Safari, but this did not resolve the issue. My second thought was to see if something snuck into my Chrome browser when I last used it, but nothing was there. Finally I found the best solution thus far, and is pretty simple. In Safari choose > Preferences, then click on the Privacy tab. Under the Privacy tab you will see "cookies and other website data", a few lines lower you will see "details...". Click on "details..." and go see if anything with "Bluekai" label appears in there, if so delete it. After you do that, quit Safari and relaunch.