Tested three times, and it seems its just deducting the five coins, and carrying on. I got three gold trophies, and a couple other ones, but no coins were awarded. I am unsure if it's an actual bug, lag, or my system. Lol.

EDIT: The bonus games ARE awarding properly - it's just the main rewards.

Re-EDIT: .....Refreshing solved the issue, but there could be an error in the code or something so I will leave this instead of clearing it.

Sounds like just the client side portion of the script wasn't working. Basically, the server was processing everything correctly, but the script was failing to make it display properly.

Clearing your cache should just do the trick.

Sometimes they can load incorrectly and they're set to cache... so it will stay broken until the cache expires (or you clear it) and then attempt again to re-download the script.