NC D-400 schedule S line 18 does not match interest from treseary from Federal Tax form

Hello,

 

   I am puzzled to see a different amount in NC D-400 Schedule S line 18, which is interest income from obligations of the united states ( T-Bills, in my case). [ box 1 of t-bill 1099 ).

   I don't know how Turbotax came to this amount? Is there a way to find out?