Form 8962 my line 27 = $-1008.00 line 28 = $1550 line 29 = $ -1008.00. Is this form allowed to have a negative number or should I enter 0?

I got a letter from IRS stating I need to send in my 1095-A and form 8962.  I have followed all directions and I am coming up with a negative amount for lines 27 & 29 on form 8962.