I have 1 Dagger and 1 Thief's knife in my inventory.

Bug reproduce:
1. Drag Dagger in Weapon slot
2. Then i have dagger skill in Action panel
3. Dagger in my inventory have green marker (as used)
4. Now you can drag same Dagger from inventory in Offhand slot
5. Still 1 Dagger action in Actions panel
6. Now drag Thief's knife in Offhand slot (it's replace Dagger icon)
7. Now you have two actions in Actions panel: one from Dagger, second from Thief's knife
8. Now drag Dagger from inventory in Offhand slot (it's replace Thief's knife icon)
9. In Actions panel still two action: from Dagger && from Thief's knife
10. And Thief's knife and Dagger in inventory with green marker

But after that i try fight with some - icons in characters slot is correct