You should NOT be using margin settings for individual paragraphs. Doing this inserts two section breaks and makes editing much harder. Instead for left and right, use paragraph indents, for top and bottom, use space before and space after. These can all be found in the paragraph formatting dialog.

Different versions of Word treat space before and after differently. I believe Word 2013 uses the larger of the two between paragraphs and by default does not use space before at the top of a page.