Barbarian Brutality class ability level 5
 

It appears this should change your simple and martial weapon skills to Expert from Trained, but is not doing so.

It looks like it is working for me.

However, it's not listing the increase skill on the class tab. If you look at your in-play character tab, or the weapon attacks themselves I am seeing the proficiencies increase from Trained to Expert when you go from level 4 to level 5.

The class tab only lists the starting proficiencies granted by the class. It doesn't take into account new proficiencies or changes from feats and class features. Sorry for the confusion.