State tax filing

Mine says the same thing, "0" except that for sure, according to simple math, I am supposed to get a refund ! The other exception is that I am only using W-2's. My only guess is that the formula for the total isn't in the box.  I'm not going to file through Turbo tax this year if this continues to be a problem. Think about it-  ZERO ??  No refund, I don't owe- not one penny either way ?  Makes ZERO sense !