A practical example might be helpful at this point. I’ve attached a simple test project that demonstrates three different ways in which one might insert a page break. The first two methods result in the same output while the third method produces a result that looks more compact (however I don’t recommend using that method as it can introduce problems, which may in fact be what you are seeing).
page_breaks.zip (138.0 KB)
I left a few paragraphs on the end of that test so you could insert a page break that matches how you normally do it, if there is some method I didn’t think of. You can zip the modified sample project in File Explorer and drag the .zip into a response here so we can take a look at it.