Georgia Retirement Exclusion

When I reached 65(?), while I still had state taxes withheld monthly, they were always refunded to me when I filed at the end of the year.  This year, however, I am being told that I am only getting back a small portion of that amount.  I am a Georgia state retired reacher, living in Georgia.  Has the law changed, or is there a mistake?  I have asked this question before, but have not received an answer, and really need help.  I would rather not upgrade, because this is the only question I have.

 

Thank you,

Maryann