I see that this was reported two years ago (with the same subject line), but don't see any solution other than starting a completely new campaign. I am now experiencing this. When using the polygon tool on the map layer, I would put a shape on one page and then find that it was also then on a previous page or pages. Further, it would not delete on any of the pages and if I overlaid it with a white line (effectively erasing it) on one page, that overlay did not affect the other pages. When I created a brand new page, the first segment of the shape was on that page as soon as it was created. I am using a Mac, OS 10.15.5, Google Chrome Version 83.0.4103.61 (Official Build) (64-bit)