Time is tracking while logged off

Hi,

 

I'm a brand new user of Norton Online Family - Premier and have a question about the time tracking feature.

 

I set up two Standard accounts on my Windows 7 PC and put time restrictions as well as time limits on each.  Both children used their accounts last night (Tues) before 10 PM.  I shut off the PC at around 10:30 PM.  This morning (Wed) I logged onto onlinefamily.norton.com from a different computer and the time tracking feature shows that one account tracked 4 hours today (Wed) and the other account tracked 2 hours today (Wed).  Was wondering how this could be as the PC was actually powered off since 10:30PM last night?  Am I missing something?  LOL!  

 

Thanks!