How to Hide Tagged Frames in InDesign

Seems like for no reason overnight all files within the same folder, and same Book, are doing this to the part number text boxes. I have never seen this, any ideas how this happened and how to correct it? I have more than a dozen files in this folder. 
Other InDesign documents open fine, it's only the files within this folder and they are all part of a book. Maybe something was done across the board to all files when the pdf was made from the Book?