1. Report this as a bug next time: https://itsjerryandharry.com/forums/report-bugs.16/ 2. Which mini-game did this happen in? 3. Was your inventory full at the time you purchased the Ender Pearls?
Yeah, that's why you didn't get your ender pearls. Make sure you have space in your inventory before buying them, otherwise you won't get them and will lose your money. You could ask staff to move this to the Bug Reports forum if you want them to make it so you're unable to buy things with a full inventory or something.
Great idea. I think it would be nice to have something that prevents you from buying things when your inventory's full, but I don't know how the store would know if you're inventory's full or not.