IP Address being blocked incorrectly?

Hi -

 

I'm getting some incorrect blocking on IP addresses/category.  For example, the following came from the alert details page:

Child warned for site category block & did not proceed: http://74.125.226.229/watch?v=Ti3t7MAwaaM&feature=autoplay&list=WL68C7C86152F24171&lf=bf_play&playnext=4 [Uncategorized]  

 

A reverse DNS lookup on this IP shows that it the IP address is owned by Google, which is allowed.

 

What is wrong here?  Am I doing something wrong?  I thought Norton was doing a reverse lookup on ip....