It would help if you said which program you were using. It's Book Designer, I see.
Some of your titles are inaccurately set. In "the Golden Bird" the first paragraph is also centred, so is presumably either a title or subtitle. Reset it as a paragraph.
1. Go to "Tools" then "Element Browser" and search for titles and then subtitles. This should help you to set them more accurately because this will show up some errors.
2. Also, go to "view" and click on "show nbsp". This shows up non-broken line-spaces. There should be 4 left-aligned spaces at the beginning of each paragraph. You will probably find a some of them centred. These are bits of former titles, which haven't been deleted. Delete them. (They will also show up as empty titles and subitiles in the element browser.)
Incidentally, if it happens another time, try uploading the BD file itself. You'll have to zip it, because it's not a recognised file extension.
I hope this helps.
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