If you select the reagents in the shopkeepers list they show the wrong body parts. However, if you select them on the right side of the shop window (where you see the amount you have) the bodyparts are correct. The alchemy itself works as intended.
Here are the errors:
Sweet cream = shows Body, instead of milk
Mandrake root = shows limbs, instead of body
Yew branch = shows milk, instead of limbs
Here are the errors:
Sweet cream = shows Body, instead of milk
Mandrake root = shows limbs, instead of body
Yew branch = shows milk, instead of limbs