If nothing else changed on your tax return, it is weird why it changed from the prior result.
The probable reason why it is doing that in the first place is because the calculation for Self Employed Health Insurance in combination with the Premium Tax Credit is rather complex. Quite frequently, that calculation can not come up with a 'final' answer, and has an amount left over. The program does not know what to do with the 'left over' amount, so it puts it on Schedule A.
If the change to Self Employed Health Insurance is large, one consideration is to change some amounts on the tax return, such as changing how some new items are being depreciated or make a contribution to a Traditional IRA. Those changes will restart the calculation, and the calculation might be able to find a 'final' answer that doesn't have any 'left over' amount.
