Since you mention the refund changed when entering the form 1095A, as you surmise, they are likely related. The earlier post is old and the 1040 has changed.
Check line 23 on your form 1040; an amount there represents a tax added in addition to your regular income taxes. This amount flows from schedule 2. Line 2 on Schedule 2 is the excess advanced premium tax credit which comes from form 8962 (Form 1095A topic entries). If there are unexpected amounts in these lines go back to the "ACA form 1095A" topic in the "Deductions and Credits" section and recheck/verify your entries as compared to your form 1095A.
You can see these forms in online versions using the steps below. In desktop versions you can use the "forms mode."
1. Select "Tax Tools" in the left hand menu
2. Select "Tools"
3. Select "View Tax Summary"
4. Select "Preview My 1040" in the left hand menu
You can always contact your Marketplace insurer to verify the form 1095A is correct and inquire how your income compares to your initial application.
@narahnicole
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