Bukkit

What steps will reproduce the problem?
1. Guess an unscramble correctly that offers a prize, for example 1 diamond
2. Guess another unscramble that offers the same prize
3. After multiple wins, claim back the prizes.
4. Run the claim command again and more items will be rewarded

What is the expected output? What do you see instead?
After winning three rounds that offer 1 diamond as a prize you should be able to claim back 3 diamonds.
If you claim again you will win another 2 diamonds, then once more will claim 1 diamond.
The end result is that you win 6 (3+2+1) diamonds, rather than 3.
If you win 4 rounds, the result is 10 (4+3+2+1), and so on.
The issue works with any item type, not just diamonds.

What version of the product are you using?
3.0 - Latest

Do you have an error log of what happened?
n/a

Please provide any additional information below.