Real life is beginning to rear its ugly head, but today I figured I could finalize the layout of a chapter quick before I went to bed. So, I noodled around with everything to make sure all the bottoms of the page spreads were even, and then I went to combine it with the earlier chapters.
And that's when I realized that I gained a page earlier, and didn't repaginate all the chapters. So everything's lined up with the text on the other side of the page, instead of across the spread.
Ai-yi-yi. It's not only that I have to do the pages again, but I have to undo everything I did. I'm repaginating now.