So, while working with my master pages, I've run across an issue where even when I select a page to have no master, it applies the one beside that page. See images below. It isn't on every spread, just on two. I've tried clearing them and selecting only the one beside to reapply. I haven't run across anything like this in another post. It shows none applied, but the circled part is one of my master pages that applied itself.
Check your data on the master page. Elements of the left page, that are connected with the right page (also grouped) and vice versa are shown on the right or the left document page, when the left side master is applied to the left page. Those elements are part of the left page and reach only over the border of that page.
To solve this, you really need to be careful that design elements stop at the page border.
Yes, this was the case. I had the tiniest sliver of color bar on the other page in both instances. Thanks so much!