I had an instance where I bought something that I hadn't clicked. I paid the price for the one I had clicked on (but did not get), though.
However, when *that* happened, the mouse could no longer open containers, move items, start transactions with merchants, or open doors. Keyboard commands still worked. Logging fixed it.
I didn't check to see if the item I wanted to purchase changed like yours did, but I was also dealing with items that only had one quantity on the vendor.
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