I am designing facing pages for a 300 page book layout in InDesign V16.0.1. When I add a new set of facing pages above pages that have existing graphic elements on them, the a few of the shape layers on some of the below pages shift approx. 18 points to the left or right for seemingly no reason. It is not all of the shape layers on all the pages, it's just one here and there, and sometimes it's text layers too. None of these elements are grouped with any others, and they are not Master Page elements. It appears to be a margin alignment issue, but I'm not sure. This also happens when I duplicate a spread into the end of a project with an odd number of pages.