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I opened a book to read, and decided to set through Preferences Header to Middle=Position in Book and Footer to Right=Progress, then hit OK and continued reading. Both Header and Footer showed corresponding values. Then I saw some changes were needed to the way a paragraph was displayed, so I closed the book and used Edit to change the stylesheet. Saved changes and opened the book again - the Header didn't show the Position in Book while Footer was Ok. I decided this was accidental so I changed Header to Position in Book again and it displayed value OK. At next editing of the stylesheet in just the same way the value for Header was missing again. I opened another book and there the Header was OK, showing Position in Book.
So repeated several times the same process with the same result - every time after editing the Header needed to be set again. Hope this explanation helps.
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