The Goblin description has a typo. It should say every sword counts for 1/2 damage, not one. It also fails to mention that goblins lose their sword when there's fighting nearby.
Another oddity in the descriptions is the use of an imperative verb instead of third person singular, for instance shouldn't "Scrounger - Steal nearby items" be "Scrounger - Steals nearby items" as the description refers to the monster and not you? Some of the descriptions also become a bit nicer when reworded from the viewpoint of the monster: "Fairy - Flee on a free square if you attack a single one." becomes "Fairy - Flees onto a free square if attacked alone."
Not quite a bug, but one small feature that I find distracting is the blinking items. If the items need highlighting a small up and down movement animation or a uniform scaling animation would suffice without concealing the items half the time.