[Bug Report]: Fair selling wrong item if you buy at the moment when it refreshes

Char name: Gwenyth
Server: Heat of Hephaestus
Realm: Water
Platform: PC
OS: Windows 7 64-Bit
Browser: Firefox

Selected a Lv1 physical defense gem that was the top left item in the fair and clicked purchase just as the fair refreshed. I was planning to combine 5 Lv1, so I noticed I did not get the gem. Checked the fair and noticed that I ended up buying the new item which was a Lv4 Emerald. It costed me 178 gems! Could you look into this issue and can I PLEASE return this Emerald and get a refund?

Thank you for your time.

I can understand that in order to prevent tampering on the client side, the client probably simply sends the position of the purchase and the server determines the item and price, but this causes the aforementioned problem. Lag time between the client and server makes this problem worse. The fix is simple: Send the position AND the item type ID to the server, if there is a discrepancy between the client's request and server, deny the request and ask for re-try by user. This prevents tampering and prevents this issue.