First of all, me and another player were doing the rat barricade quest and we got plenty of XP, unlike usual.

And second, I noticed that my quickbar had the item 'Reserach of Jankleduurtz', even though I had no form of that item in my inventory (or even knew it existed in the first place!)

Tried out the magic missile funtion in it, and it said that I can't use the item, since I don't have it obviously.

So either way, major bug.