There is a bug that occurs with placing the Champion's Cudgel (it might also be any weapon, I don't know) on a weapon rack inside Severin Manor, but I am not sure if it only happens with one of the weapon racks or all of them, but right now my Champion's Cudgel cannot be removed from the weapon rack. It's almost like the weapon rack ate the weapon, because I can't see the weapon nor can I activate it to place a new one. I don't know how to word this if I were to add it to the bugs section on the page, so I thought I'll just make a comment about it in case it happens to someone else.
If you are facing the door from inside the bedroom, it's the weapon rack on the right side of the door in which I'm having this problem.
Weapon Racks are pretty buggy in general but very buggy with unique weapons, probably best never to trust them with a non-replaceable weapon. Weapons vanishing and the racks become inoperable is on the racks bugs list and on Severin Manor's.