InDesign. When I move pages, going forward and backward in the text jumps around between pages.

Hello Author57

It’s usually better to rearrange the text rather than rearranging pages in order to rearrange the text.

What you’re describing sounds like the text frames are still threaded in their original order. Moving a page moves the frame, but it doesn’t necessarily redefine where that frame sits in the text flow. So the story can reach the bottom of one page and then jump to whatever frame was originally next in the thread, even though that frame is now somewhere completely different in the document.
 

Turn on View > Extras > Show Text Threads and you should be able to see exactly where the text is flowing.
 

You mention resizing all the text frames to avoid widows and orphans. I wouldn’t normally handle them that way either. Typically I’d have one consistent text frame size defined on the Parent page and let the text flow through it.
 

Widows, orphans and awkward breaks are generally better controlled through the text itself, using Keep with Next, Keep Lines Together, paragraph spacing, nonbreaking spaces or hyphens where appropriate, and preferably having those controls built into the paragraph styles.
 

There are exceptions to every rule, of course, but consistent text frames, properly threaded stories and well constructed paragraph styles usually let you rearrange or edit the content and have everything reflow naturally with much less manual adjustment.
 

If these really are separate chapters, I’d also consider whether each chapter should be its own story, or even its own InDesign document managed through the Book panel. That makes rearranging chapters considerably safer than physically shuffling pages containing one long threaded story.