My San Van bucks are all gone?!!

My San Van Bucks are gone! While I was browsing the in-game store earlier I noticed that all of my San Van bucks are gone even though I didn't purchase anything with them. Then I looked in my inventory and I saw a Creature board that I never purchased and I'm pretty sure I didn't misclick anything. I would like to get all the San Van bucks I was saving up back so I can buy something I actually want with them. If I can't trust the game to not make purchases without my consent, then I certainly won't be considering buying in-game currency with real money.