When I purchase multiple items at multiple sale prices on the TP, not all of those items disappear from the listings if I hit OK. I get the items I purchased, and I pay the money, but fewer items disappear from listings than I purchased.
Given that the listings have the same number at each price instantly, I don’t think it is a bot.
I’m not sure how to trigger or not trigger it, but it happens about half the time I buy multiple sale listings at different prices and hit OK.