The amount on line 27 of your form 8962 may be correct. If you had coverage for the entire year and the amounts in each row of form 1095-A are the same, the instructions for Form 8962 may allow you to check box 10 "Yes", then enter the total of column F of your form 1095-A in row 11 on form 8962, column F, and then skip to line 24. It will not affect the calculations on the form.
You can read the instructions for Form 8962 by using this link: Form 8962 instructions