Why was my state refund a lot less than what you show on my return I filed with Turbotax?

According to Turbo Tax I should have received a refund of $331 from Georgia.  Instead, they only refunded me $17.  It has been 4 weeks and no letter of explanation had been received. How do I find out why this took place?  I have used Turbo Tax for years and this has never happened.  Makes we wonder if there is a bug in this year's GA state tax program.