Thumbnails in Pages Panel Out of Alignment

As you can see by the screen shots, some of the thumbnails in my Pages panel are not lined up.

Project Description: I have a scrapbook of letters sent home during WWII (the original scrapbook is fragile and falling apart ... hence this project). I want a photo of each "Full Scrapbook Page" to start a new section/chapter, and have it appear on odd pages. Then, I want each letter or postcard to appear on their own separate page. 

Two problems at this time:

1. I'm having trouble getting each Full Scrapbook Page to appear on odd pages.
2. Why are the thumbnails of pages out of alignment (not side-by-side).

I've looked in the Adobe documentation and have watched countless YT videos.

Thanks tons for any assistance.