How are you trying to add the page?
I've used the insert page in the pages dropdown menu, and I've grabbed a master page and dragged it down to the pages area. In both cases ID adds 2 pages.
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And this is the very last chapter, and the very last page? Something is not quite right. Using the insert command or dragging the master icon (as opposed to the name) should both insert only one page.
Can you share this file?
I tried again and it did the same thing but then I went to edit, undo update book numbering and doing that left me with a lefthand final page. Thanks for the help.