CreateSpace is not Kindle and vice versa. All you do when you use create space is what you'd do if you didn't use CreateSpace - upload that document to Kindle. That's how it works. I did Welcome to My World via CreateSpace and it's perfect - what I previewed on Kindle was not and it was the CreateSpace document. Word and Kindle are not happy bed partners. I read up on it last night. If, for example, you tab over for your paragraph indentations, which everyone on the planet does, it doesn't like that, hence the paragraph indentations are wonky, at least in the preview version. You're supposed to set up the tab over before you write so it's done without using the tab button, but I couldn't figure out how to do that, frankly.
Also, I'm told that every Kindle device and every eReader is different and will display differently depending on the person's settings and preferences. So, while it may look wonky in preview it may not on an actual Kindle. Then I read an article by someone who's "mastered" the art of Kindle, but her books look NOTHING like books and I don't like that. But that's what Kindle is - it's a text flow and you can't think in conventional book design terms. The ideal Kindle presentation is just text - no fonts, no centering chapter headings - it's nutty to me and not a world I care to be in. I will continue trying to figure out how to set the paragraph tab so I don't have to tab and then I'll see if that helps - because everything else is fine on the preview Kindle. I've done a save as so I won't hurt what's there now and can go right back to it.