Problem with Interpolation - Scattered Data away from initial points.

Hello quys! I want to make interpolation of scattered data (x,y,z). I also plot these points (x,y,z). The matlab code is the following:

 Interp_z=scatteredInterpolant(x,y,z);
 figure
 [qx,qy] = meshgrid(y_start:intervals_y:y_stop,x_start:intervals_x:x_stop);
 qz =  Interp_z(qx,qy);
 mesh(qx,qy,qz);
 axis([y_start y_stop x_start x_stop z_start z_stop])
 hold on;
 plot3(x,y,z,'o');

The problem is that the 3D surface that is created and plotted is away from points (x,y,z). (see picture attached) Could anyone please help me, to find a solution? Any help will be highly appreciated!