I think this is a problem with SkyUI itself, and I hope this is fixed in the next update. I have two Elven daggers. I enchanted one, but left the other one alone. When I try to dual-wield them, things work fine. In the favorites menu, the two daggers are on separate lines, which makes sense since one is enchanted. However, when I try to put both daggers in one group, only one can be present. Putting the non-enchanted dagger into the group "replaces" the enchanted one instead of being added below it, and vice-versa. Dual-wielding daggers is essential to certain stealth tactics, and unfortunately I am not able to fast-wield a non-enchanted Elven dagger and an enchanted one. I'm pretty sure it's because the favorites menu of SkyUI cannot differentiate between the two.

Any help is appreciated. Thank you!