I found the "problem". I'm using onDrawCell on this grid, to color the lines according to the value of one specific field. I'm using this:

if dm.qrFinanceiro.Active then
      begin

         with (Sender as TIB_Grid) do
           begin
              if (dm.qrFinanceiro.BufferFieldByName('tipo').AsString='PAGAR') then
                 Canvas.Font.Color := clRed
              else
                 Canvas.Font.Color := clBlack;
               DefaultDrawCell(acol,arow,rect,state,GetCellDisplayText(acol,arow), taLeftJustify);
           end;
      end;

That taLeftJustify is my "vilain". So, how can I identify what field is been drawing, then I can change that taLeftJustify accordingly?

Thanks in advance