Reported elsewhere

Yeah, I second this. I just tested it actually to see if it was true. Deleting the second item but I was able to refresh a super rare that I got and got a second one even though there was one in stock when I bought the first one.

Thank goodness someone reported this! I was buying a Dark Light Potion from the Apocalyptic Apothecary - I knew there were at least three in stock so kept refreshing and ended up with six. Then I tested it on a couple of other shops too (only on easily obtainable items)

Plus there are huge amounts of some items showing as available in some shops - since when does Spells Galore carry 72 Honeysuckle Oil, or 77 Rabbit Foot?