Received a Notice of Return Changes in Georgia as part time GA resident - filed in GA, NC, VA

Lived 1st half of 2019 in VA, 2nd half in GA. Received a notice of return changes as GA increased my AGI (single line on form) without explanation of why or where TT failed to calculate it correctly based on Federal AGI.  I have logged into the GA tax website without answers.  Do I have to pay the amount owed as calculated by GA? The only thing I could submit to the state for documentation would be my TT return calculations which they presumably already have.