The problem is the dagger combination, both the pictures of your 2 daggers in the character sheet must face opposite ways. It took me 3 hours to figure this out :s
I'm not so sure it is a bug. More of a undocumented 1st hand 2nd hand weapon configuration. My Theroy: They didn't want to have right only and left daggers. but still wanted to have a right and a left combination. But not dance with two left feet.
The problem is the dagger combination, both the pictures of your 2 daggers in the character sheet must face opposite ways. It took me 3 hours to figure this out :s