Legend not displayed correctly

I am plotting a 3-D plot of hand positions. 'Target positions' are marked with an 'o' in green. But when the legend comes up both hand and target positions are shown as straight lines.

for i = 1:length(filtered_hand)

      plot3(handles.axes4, filtered_hand(i,1), filtered_hand(i,2), filtered_hand(i,3))

      hold on

      % This for loop is used to check whether 'i' is equal to the index of a
      % target position. If it is, the target position with an 'o' and the               %       coordinates of the target are displyed on
      % the GUI in a static text box.

      for j = 1:8
      if i == index(j)
         plot3(handles.axes4, filtered_hand(index(j),1), filtered_hand(index(j),2), filtered_hand(index(j),3), 'o g')
         set(handles.text1, 'String', ['The position of target ' num2str(j) ' is x = ' num2str(filtered_hand(index(j),1),3) ' m  y = ' num2str(filtered_hand(index(j),2),3) ' m  z = ' num2str(filtered_hand(index(j),3),3) ' m '])
         hold on
      end

      end
      xlabel(handles.axes4, 'x positions(m)')
      ylabel(handles.axes4, 'y positions (m)')
      zlabel(handles.axes4, 'z positions (m)')
      title(handles.axes4, 'Hand positions through movement')
      grid on
      pause(10^-11)
  end
  legend(handles.axes4, 'Hand position', 'target position')