data shuffling in itab

Hi experts,

Iam trying to display data in ALV.

Iam using this statemennt.

  APPEND LINES OF T_EKKN TO T_DISP.
  SORT T_DISP BY AUFNR EBELN.

In the output, data is shuffling.For example i have ebeln.

First 4 charecters are displaying in 2nd column.Actually it should display in 5th column....

What might be the reason?

reward guaranteed

thanks

kaki