Mavic Open Pro C Quality Issue

Just laced and trued a set of Open Pro C rims in the CD finish and the rim joint is so off that I am unable to get the rims round. There is a 1mm difference in rim height from one side of the joint to the other. Never had this issue with Mavic rims before. Next time I will listen to my son and go with Hed Belgiums. Very disappointed as the "bump" will be felt when riding.