time not calculating

I just set up the Norton Safety Minder for 2 kids.  It is reporting web sites visited, but shows activity in the middle of the night - mostly ad.doubleclick.net - and it shows no activity  under time used, even tho it does show activity, with times, and I have it set to count only time actively used.  Suggestions?  Could having the Windows Parental Controls turned on have anything to do with this problem?