Chrome window vs. Chrome Incognito window

Hi.  I think I found security hole in NIS. When using Chrome to visit website (www . savevid . com) Norton alerted me it was unsafe website.  However when I used Chrome's Incognito window to visit same webpage NIS did not alert me that it was dangerous. Would anyone know who and how I should bring this problem to Norton's attention?

Thanks.

[Edit: Removed hyperlink to a potentially malicious URL to conform with the Participation Guidelines and Terms of Service]