No, this is normal based on how the amended return process works.
When you file an amended return, your original return is still processed and the refund is issued.
The amended return has an entry on it to report the amount of your original refund on line 18. The assumption that you received this money is what is creating the balance due.
Since you haven't received your refund yet, it's possible that the IRS will correct your return. It's also possible you will still get the full original refund.
You can wait a bit longer to see if the IRS issues your original refund, or if they mail you a letter explaining that they have made changes to your return.
If they issue the original, full refund, you should pay the balance due on the amended return in full as soon as you get it, but no later than April 15.
If it gets close to April 15 and you still don't have your refund, you may want to call them and ask what is happening. Follow this link for contact info.
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