The difference between enclosed cam and open cam QR units is a frequent topic here. So to is the axle extension beyond the lock nut WRT the drop out's thickness and does the QR bottom out bon that axle end. Broken axles is another common topic that can cause wheel shift during riding. Spokes that self loosen while riding (to allow the rim to shift over) yet somehow retighten before the beginning of the next ride isn't a common thing Andy