Links Between Cells Are Not "flat" - JointJS

When I drag my 'table' cells around, most of the time connections are flat / leveled (like the vertical portion of the link or the small bit that comes out of ORDERLINE table), but

Solution 1:

is this the manhattan router? if so, there there is a trick how to improve this. Try to set the same value to paper.option.gridSize and to router.option.step like in the example below where is set to 20.

var paper = new joint.dia.Paper({
    el: document.getElementById('paper'),
    width: 800,
    height: 600,
    gridSize: 20,
    perpendicularLinks: true,
    model: graph,
    defaultLink: new joint.dia.Link({
        router: { name: 'manhattan', args: { step: 20 } },
        connection: { name: 'orthogonal' },
        attrs: {
            '.marker-target': { d: 'M 10 0 L 0 5 L 10 10 z', fill: '#fff', stroke: '#000' },
            '.link-tools .tool-remove circle, .marker-vertex': { r: 8 },
            '.connection': {
                stroke: '#000', 'stroke-width': 1
            }
        }
    }),
    interactive: {
        vertexAdd: false
    }
});