Yes, as RogerD1 states above, from looking at your documents posted it appears that your original refund was $2,346. After you amended your tax return, your adjusted refund is now $607 (See line 34 Amount you owe). That's the amount you should have gotten if you had filed your tax return including your Form 1095-A in the first place. The difference between the two is $1,739. That is the additional amount that you will have to pay the IRS.
Line 20 of your Form 1040-X shown above is the amount you owe after adjusting your tax return for your missing Form 1095-A, $1,739.
The IRS originally gave you $2,346 for a refund. After you amended your tax return, it showed that you were supposed to get only $607. So the IRS gave you $1,179 too much and that is the amount you owe them back.
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