Reverse Equips lvl up.

A friend of mine has been training lately wearing both, a Reverse Engaw and a Reverse Evernew, but she told me that when she started training, her overall had 81% exp and her bow had 0%. After a while, her bow had gained 3% but her overall remainded the same.

Is it possible to train 2 or more Reverse equips and gain experience for both? if so? is it possible that just one getting exp is a glitch?

Thanks