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Like if you have magic skill 5 or more and encounter a boar, his stats are adjusted for him to be tougher. While if you encounter one by rushing through the game and spending little time for training, the boar you would encounter would also have weaker stats, to not overwhelm the player. Or maybe it's just always a bit random.

I don't think it goes off player stats - maybe random
If Random though then it makes those books with enemy stats in it rather useless doesn't it

Also it seems items have to be bought/found or at some point unlocked for them to appear on Item lists (otherwise it will just say Illegal Item)
Maybe this was some kind of Anti-cheat method used by Westwood