Non taxable income being taxed

I am submitting a W2 for non taxable income with IHSS because I live with my grandmother it is non taxable so box 1 shows zero and I just show the non taxable amount in box 12 . However after submitting this on intuit turbo tax it lowers my refund by over 1,200 dollars . I have reviewed taken it and re entered to make sure I did not make a mistake but it always drops my refund by 1200 dollars ? Again yes it is non taxable soc 2298 income the W2 was issued correctly by the state but on turbo tax it is lowering my federal amount ? What can I do to fix this ?