I got a set of Givi E22 boxes and am mounting them on SW Motech racks with the Givi attachment. The boxes take a good push down to get the mushrooms to seat. That is getting somewhat easier as I've mounted them a few times. The upper clip attachment takes a very firm push on the plastic to get it to seat. It will seat though. Does this sounds normal or not? When removing the bags the upper mount is easy to dislodge but it is hard to pull the case off the mushrooms.