You only enter it from the 1095-A. When you enter the 1095A there should be a box to check for self employment. If you enter the 1095-A and select the "Self-employed and bought a Marketplace plan" box, it will automatically include those premiums in the SE Health Insurance section. So you shouldn't enter it again on schedule C. And the repaid amount is a circular calculation. Turbo Tax handles it.
Self Employed health Insurance does not go directly on Schedule C so it will not reduce your Net Profit or self employment tax.
If it does exceed your net self-employment income it gets split automatically. An amount equal to your net self-employment income goes on Form 1040 Schedule 1, and the remainder gets added in to medical expenses on Schedule A.
