You may have accidentally subscribed from iTunes instead of accessing your QuickBooks subscription. That's why you're charged on both subscriptions. I recommend contacting our support team so they can verify the charges. They also have the tools to pull up your account in a secure environment.
Here's how to reach them:
- Sign in to your account.
- Click Help.
- Select Contact Us.
- Type your question.
- Click Continue.
- Select the best option that you want to contact support.
To give you an overview of how QuickBooks Self-Employed (QBSE) tracks your business, here's an article for more details: QBSE Overview.
Let me know if you have any other concerns. I'll be right here to help.