Yup, it is lame (it happened to me right away). Report it to FANDOM staff via "Contact us".
Someone somewhere thought we wanted to add comments about categories before we actually look at what's in them or their description. This may have been around for a long time.
The Category: namespace is not included in the Mercury skin, so probably something to do with that.
The mobile skin was always a minimal solution. It may get better in UCP, but more likely many of the features will just be gone.
What do you think?