Buying deck customisation

When I bought the Halloween 2022 cards for 525 gold coins from the deck customisation. It told me error when I clicked ok I still had same amount of coins so I tried to buy it again but got the same message and still had the same amount of coins. Logged out and back in but my coins had gone down but just over 1000. Looks like the shop has let me buy the same thing twice when it should only let you buy it once. Don’t really care about 525 gold coins but the shop should let you buy the same thing twice.