Yes, this same issue bothers me as well. I compared it to the passenger seat belt as well as to the driver's seat belt height in another MS and found that my driver's side seat belt buckle is about 1-2" higher. My service advisor told me that the height cannot be adjusted, so he would order a replacement part to see if the length is any different. I'll give you an update when the part arrives in 1-2 weeks.
Incidentally, I didn't have a problem with the rear seat belts when I tested them, but in fairness I rarely sit in back!