Something weird going on with arrows

[CorstoTerrore]

So, I've had this happen to me a few times, now. Another PC gives mine a small stack of ice arrows. The ones with the picture of a black shaft and white feathers, doing 1 extra cold damage. But when they transfer over to my inventory, they turn into goblin acid arrows, which do 1 acid damage instead. It's a pretty weird bug, and only seen it happen with these ice arrows.

[Howlando]

Some Class C DM just didn't change the tag. Where do the ice arrows drop?

[CorstoTerrore]

I have no idea, other PCs keep giving me theirs. Best guess? The kobold lair quest in the Crosscurrents.

[CorstoTerrore]

Little update in case this is still in need of fixing. The ice arrows drop from morghoul archers at least. Also, when I pick them up myself, they stay as ice arrows. So it's the trading that makes them change. Changeling arrows?