Seeing two charges?
It's possible it may be an authorization hold. All orders create an "authorization hold" when you place an order, which is similar to what happens when you check into a hotel and the concierge holds a charge on your credit card. Once the order goes through, this hold clears and you should see only the single charge for the order.
To learn more about authorization holds, please review this article:
複数の請求に関する問題についてさらにサポートが必要な場合は、調査のため下のフォームに詳細を入力してください。