Potion of Speed problem

[Googi]

So there was this guy, named "Markus Flight", with the account Markus C. He wanted me to make a Mithril Chainmail of Berwean for him and gave me the ingredients. There was something strange with his potions of speed. One of them was seperated in the inventory and cauldron from the other ones, so I tried using all my identify skills and identify spell then laid all the potions out and picked them back up. They were still kept seperate. All 5 were named "potion of speed" with no spelling, capitalization, weight, image or any other differences. I told him that I didn't think that the recipe would still work, but he wanted me to do it anyways, so I did, and it didn't work. It would be good if he could get back the stuff he lost (Potion of Dexterity, 5 potions of speed, panther leg, 5 big crystals of mana and a golden chainmail). It would also be good to fix this potion of speed bug.