Standard requirements for closing a quick release are user dependent. The user should feel resistance from halfway to full closure. Therefore a hug strong guy would naturally tighten his quick release with more force....since it takes more resistance for him to notice resistance. This discrepancy in measuring tightening forces is irrelevant on the rear tire, since the axle is in a vertical plane below the frame....essentially making it impossible for it to fall out of the frame. However the front fork has a angular rake, which means the front wheel has horizontal and vertical components. Therefore, the front wheel can pop out of the fork. Please use more care installing the front quick release. Use more force to tighten it and make sure the quick release points up after installation.