I have found recently that my Xpro-2 with the 23mm 2.0 has a discrepancy in the distance meter. While in autofocus, I focus on an object 15' away, when I switch to manual focus it's at 30'. Similarly with an object at 3 foot distance, I manually focus to 3' and there appears to be some blur. Oddly this doesn't occur with my 27mm. Any thoughts?