When the wing gear fails, the aircraft tilts around a datum line drawn between the good wing gear and the opposite body gear. As well as the lateral tilt there is also a nose down element. As the inboard engine is forward of the gear, this causes the inboard pod to be closer to the ground. It is difficult to demonstrate this using two dimentional drawings. However, if you put an aircraft model on a flat surface with the wing gear over a gap in the surface (didn't want to ruin the model by breaking off the gear) you will see the effect on the pod heights.
Airclues