Looking at Page 3 and 4, I see no difference.




Looking at Pages 1 and 2, I see a difference.




The causes and remedies for this are described in Improving the Bottom Line by Suzanne Barnhill, MVP which is about what makes the bottoms of different pages have different levels. That article concludes:



"The bottom line, therefore, is that there is no way to achieve uniform page length without considerable work on your part, “saving” or “making” lines as needed. In many cases, the sensible approach is to live with uneven pages. You can make this appear more intentional by starting major divisions (Heading 1, say) on a new page. If the problem is mostly caused by footnotes, you can use endnotes instead. You can certainly abandon widow/orphan control: it’s very common nowadays to see single lines at the ends and beginnings of pages. Whatever approach you take, however, it is bound to involve some compromises."