Just now I bought an item from the Subeautique. There was only one if that item in stock when I clicked, but when I went to my inventory, there were two of it there. Looking at my on-hand sp, it seems that I paid for both of them. I did click it rather quickly, and my mouse is occasionally prone to double clicking when I don't want it to, so that might have something to do with it. I don't mind paying for both items, but this is probably something that shouldn't be happening.

Edit: Also getting double purchases from static-stock shops: Carnival stand, Esther's, Fresh and Flavourful, and Quest shop so far.

I've been having the same issue with places like the quest shop. I've tried clicking once, opening in a new tab. But for some reason, it will think I clicked 2+ times. I don't want to waste sP/points on something if I only wanted one copy.

I wanna say I've only seen it so far when I use Safari. Don't want to use this site with Chrome/Firefox since they heat my laptop up too much.

I've also been getting double purchases from other shops, namely the quest shop and Esthers (although I've not tried others). This happens even why I try to avoid accidental double mouse clicks by opening the buy link in a new tab. Also, there are a couple of cases where I've gone to buy a sticker, accidentally got two, and when sticking to myself with the Hustler, it transpired that both have been added to my stickers.

I'm using Chrome.