Goup name on Web filter replacement page

I've set up FSSO on a FG200D and under User & Device -> Monitor -> frewall I can see the authenticated users with their respective User group. This user group is the group name that I defined under User & Device-> User -> User Groups. To that FG group I assigned 2 AD groups as FSSO type. All seems to work fine, but when I access to a web that should be bloked by the web filter profile asigned to the policy the Group name information is empty. I think it shoud appear the FG group, isn't it?