I should have screenshotted it, but it wouldn't really have been helpful. I could post the save where it happened, but it was a while ago and I doubt savegames retain enough information to figure it out. I think it had something to do with it having been reapplied when I loaded a save, or perhaps some obscure right click or wizardlands related thing. Either way, with the new UI for displaying buff stacks, the "Hands Full x2" was unambiguous.
Well, honestly speaking I do believe if you say that happened. Buffs are sometimes screwy and if this one got replicated after loading the game I could believe it. The only problem is how it had placed a second instance of this buff when it ought to be impossible for it not to remove said buff when you equip something that is a weapon, even after loading the game. Even after loading the game that ought not to happen... Ugh... Nicholas! Something broke!