When I look at my document onscreen, it just tips over onto a 3rd page, but when I print-preview it is only 2 pages. The page size is correct, and it exports as a PDF of 2 pages perfectly. It’s driving me crazy, and I’m thinking of going back to OpenOffice if I can’t fix this.
To get a sensible answer, edit your question (don’t use an answer) to describe the structure of your document. It is better to enable View>Formatting Marks. I bet there is an empty paragraph at end and that Export/Print automatically inserted blank pages is not checked.
When editing, don’t forget to name your OS and LO version.