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I just found a solution.
Use \raggedbottom before begin{document} and it works.
But, I still don't understand the change of behavior between the oneside and twoside options...

Hi there, here is my problem:

I have wrote a document using the book document class with the following options: 11pt, oneside, openany

I now want to make it double-sided so I removed the 'oneside' option.
When I remove it, the page vertical alignment changes drastically (and not in a good way for ...