Oh that is probaly because you were not in human form and because of that had no gauntlet equipped. So you couldn't see when you got new gauntlet skills.
I entered in a different form, but was forced into human. I had the Shell Gauntlet equipped.
Unfortunately I haven't found a way yet to display a second level to show it for the weapon class. Also what do you mean by subweapon page?
Under the Item menu, you have many entries, but none show the subweapons at all.