While Exportin a drawing to JPG or PNG or other graphic formats, Draw only exports selected page. In fact there is a seection checkbox in the export dialog but it doesn't work.
Similar bug report for Impress:
Actually Export in Draw and Impress are the same so I will mark this as duplicate of the Impress bug.
Just for clarification - selection in export dialog means to export selected element of a page / slide (for example a chart) and it was never meant for exporting selection or range of pages / slides.
*** This bug has been marked as a duplicate of bug 67614 ***