I picked up a 2nd staff today and it was in my bag. i was using my old one at the time and the new one:

(339 H): The staff of vindication vanishes!
### Tragically, Zerk's unique item staff of vindication just broke!

(339 H): eq
On body: some red dragonscale armor (+3)
On arms: a grinning skull armplates (+3)
On legs: some gorgon scale leggings (+3)
On neck: an electric-plated neckguard
On hands: a spiked chain gloves (+4)
On head: a cloud dragonscale helmet (+2)
On waist: an astral driftmetal girdle (+3)
On feet: some gorgon scale boots (+3)
On face: an elven mask (+2)
On finger: an alanthium corbite ring
On finger: an alanthium corbite ring
On finger: an alanthium corbite ring
On finger: an alanthium corbite ring
On finger: an alanthium corbite ring
On finger: an alanthium corbite ring
On finger: an elven rune ring (+3)
On finger: a mithril ring of protection (+5)
Shield: a mithril-plated buckler (+4)
Wielded: a staff of vindication (+3)

(339 H): l vin
It's a blackened staff with mystical runes of the sun god.
The staff of vindication (+3) is a unique or limited object.
The staff of vindication (+3) is a weapon(staff).

Not a glitch, but perhaps a process bug.

When you get a lore/limited item, the game remembers "Zerk has this item somewhere", but it doesn't remember where the specific object is. The game only knows you have 2 staves, not which is which, so it goes after the first one it finds. The order is probably inventory / eq / shop / storage. So essentially once you pick up the second staff, whichever the destroy function finds first is the "oldest", and the one you were wielding becomes the "newest".