I don't have a Nook, but the Kobo devices have a similar bug: sometimes, the last line of a chapter is shown on a separate page. I have never found a pattern for when this happens. Seeing this happen on another device, makes me think it is a bug in the Adobe RMSDK. This is used by the Kobo devices for rendering epubs on and is probably used on the Nook as well. If this is the case, then it is the same bug on both devices and there is nothing you can do about it.
Actually, there is something you can do: report the bug to B&N and ask them to fix it. If enough people report it, maybe it will be fixed.
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