When doing an amended return, the meter is reset to zero and may show odd numbers until all of your changes are entered. When you're finished with your changes, the refund meter shows any additional amount owed or refunded to you. This amount is in addition to your original payment or refund shown on your originally filed tax return.
If you owe which should show in red/gray and say balance due; you will mail your payment that you owe along with that amended return. If you are due an additional refund, it should say refund and show in green. This link shows you how the math works when you are doing an amended return How does the refund math work on amendments?