I hope this is the right place to post this.

Anyway, recently, while trying to shop at Subeautique, I keep getting this:

"Item was previously purchased, sorry!"

After I attempt to buy the item. But, I go back to the shop and there are still X-amount of them in stock. So it's not that it's out of stock. I've gotten this numerous times.

Is there something I can do to fix this? Or is it just a glitch?

It's likely the main shop page is still in your cache when you go back to look. Try a hard refresh (Shift+F5 on Windows, Ctrl+Shift+R on Mac) and see if that helps.

Oh, hm. I think it's working. That must've been it. Thanks a lot!! :)