You've entered your net profit of $75,891 twice. Remove one of those entries. If you received a Form 1099-MISC showing this income, box 7 of that one 1099-MISC form in TurboTax is the only place you should have entered the $75,891.
The maximum permissible is 20% of net earnings, not 25%. Net earnings is net profit minus the deductible portion of self-employment taxes.
