are you changing font size? i havent checked this in years but back in the day people would get confused between actual page number of the book and the virtual page number dependent on font size and reflow.
it's possible on the sony(again havent look at this in along time but i do remember it happening) that if the font size is changed accidentally it looks like you are some actual pages distant from the correct point when you are only virtual pages distant.
as for your above example. i suspect someone accidentally bookmarked page 9. when you were fiddling with it and changing position etc you somehow evoked the bookmark and returned it to that page.
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