I'm not sure if this bug has been reported yet but i encountered a bug where if you have 2 artifacts (with names) and you take one of the artifacts off the stack, put it into an empty slot, stack the artifact again and take it off again the stats on that item will reroll. I don't want to say it's gamebreaking but this would make the archeology skill "This translation is all wrong!" useless. Oh and i've been told that "This translation is all wrong!" is suppose to make the item have one less bonus every time it gets rerolled and eventually becomes "lost in the museum?" but i've been rerolling this one item for about 50 times and it actually gained more bonuses. So i dunno if it's a bug or it's intended to give random bonuses and that the information is wrong but just wanted to point it out as well.
Yeah artifacts aren't supposed to be able to stack. (It can also result in them losing all their stats, on a less useful note)