Unknown category on Android

We run Norton Family on our Windows 7 PC and our Android tablet (a Tesco hudl Android 4.2). All updates are installed for the Norton app.

 

On the PC everything seems to behave itself but on Android sites are blocked which (rightly) aren't blocked on the PC. These are flagged as being 'unknown'. I have checked and double checked the we haven't blocked the 'uncategorised' category, but have to keep adding exceptions for sites to be able to visit the on Android.

 

Am I missing a setting somewhere?

 

Thanks in advance. 

 

Steve