while equipping and unequipping some equipment i noticed that some should give points to wandcrafting, but nothing gets added in the character screen. (no idea if it actually adds for crafting wands as i lack materials for that. in the save here its for example the shoes and crossbow. (oh its "realm of the diggle gods" btw... didnt see that addon bug subforum first)
The "wand" stat you find on equipment is actually the old "wand lore" stat from before wand lore became a crafting skill. The devs forgot to remove it from the random stat bonus tables.
It's everywhere, because it is not a bug proper, but rather a stat that was rendered obsolete and is yet to be taken out of the game.