I've had quite a few do this, and it is not uncommon. Some have suggested that the culprit is typically the rear ring being too close. However, in each instance I've experienced, the selector rings were too tight right out of the box. I had a Vari-X III that was so tight, it dang near took a wrench to move. Leupold will tell you they should be a little firm, but that was ridiculous.
One thing I have noticed, Leupolds are typically stiffer than other manufacturers. If it bothers you too much, send it back to Leupold and they will correct it.
