I used my Robinhood debit card to purchase 15 cubits on the tebex store, but the payment did not go through and it declined my transaction. However, on my card transaction history I was charged.
Give it 24 hrs and see if the transaction is recanted on your bank statements. I've had failed purchases in the past do the samething. If in 24 hours it doesn't go away; I'd make a ticket here and put the category as Webstore support. https://manacube.com/support/