No more tracking cookies listed on Scans??

Hi I now have Norton Internet Security and before this I had 360.  Up until a couple of weeks ago the scans I ran always found and fixed a lot of "Tracking Cookies"  Almost everytime I ran a scan this was the case.  

 

Now suddenly a couple of weeks ago, my Scans no longer seem to find any tracking cookies at all.  I checked under settings and it does still say to remove tracking cookies.  

 

Why would my scans go from finding lots of tracking cookies to suddenly never finding any?  Should I change some other kind of setting?  What could have caused this change?  I have not changed any settings?  I did run an "optimize"  --could this have effected this?

 

Thanks, MOD7