Section Bounding

I am modeling replacement window installation. I did import a Marvin DWG file but can’t find any stray geometry in those files and when I place a section in that file it is tight to the geometry. When I place sections (both axis) in my window detail model the section box is huge. I can’t see anything in the outer ranges of the section box and the bounding boxes of the groups and components are all tight to the geometry. I deleted the Marvin geometry but the section boxes are still WAY outside where I need them to be. I tried select all but what ever is “out there” remains invisible. Any ideas?

check for hidden objects via View menu
check axis orientation of objects, this can be off the normal and protrude beyond the seen geometry