Sorrys, forgot the details:

1- Reporter:
Loke

2- What server:
35 - Vengeance of Hera

3- Platform:
PC

4- Operating system:
Windows 8

5- Description:
Today, Sunday 11 august, around 1700 UTC+1. I challenged BluDragon in the arena for 100 gems. I won, but only received 50 of them.

6- Summary:
The status text says: "You defeated BluDragon, looted their 100 Gems and moved up two 22."
But when I tried to collect the reward, I only received 50 gems.