is this a bug? or unique items just resets?

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The shopkeep gives you 377 gold coins for the blackbranch crossbow.
sell crossbow
(345 H 12 M):
The shopkeep gives you 336 gold coins for the blackbranch crossbow.
(345 H 12 M): sell crossbow
sell crossbow
sell crossbow
sell crossbow
sell crossbow
l
save

### Tragically, Xanorin's unique item Tyrnearretyn's sceptre of healing just broke!
The buckler of the misfit vanishes!
### Tragically, Fubar's unique item buckler of the misfit just broke!
(345 H 12 M):
The shopkeep gives you 371 gold coins for the blackbranch crossbow.
(345 H 12 M):

Those unique items will just break over a given amount of time.

ah.... icc...

I think all uniques will expire or break after a set period of time. I've seen multiple times "Tragically, Bodhi's unique item Darkfinder just broke!" or Sceptre of Ares, or Wolvesbane, or Soul Stealer, or Cloak of the Vampire, or...