Negative Gems?

After buying the anniversary pack my gem balance went to -344 but I got the coins, Im at a loss becauss there is no way Ill be able to compete in the challenge for the new card and its very hard to aquire 344 gems just to reach the 0 balance. I believe this to be a bug that the devs have to fix soon, I did spend my money after all for those 500 gems and 20,000 coins. Please fix soon!

Lord Draxxar about Clash Royale, v1.8.1