If you are working with a facing-pages document, page 24 will be a left-side page. The next page added to that document will be a right-side page (and if two pages are added, a left-side page will follow as the second of those two pages). If you were looking at an actual book, there would be a right page after page 24, and if you don't want content, you could leave it blank, but it needs to be there.
And it's also possible that I have misread your question. Are you saying that you have a 3-page spread when you add two pages after page 24?
Sounds like page shuffling is disabled....
Sorry for the confusion. Yes, after adding two pages to page 24, I have a three-page spread.
I would like to have all two page spreads throughout the book, but every time I add new pages they attach on to the previous page, creating three or four-page spreads.
See my previous response....