It would only do that for the following reasons:
1. You have a SectionBreak in you document and in the second Section, the
page numbers are formatted to start from 2 rather that to be continued from
the previous Section. To change that, with the selection after the fourth
page, form the Insert tab of the Ribbon, click on the pull-down for Page
Number in the Header & Footer section of the Ribbon and select the Format
Page Numbers item and check the radio button for Continue from previous
section.
2. You have a Field Construction that is subtracting 3 from the
pagenumber if the number is greater than 4
{ IF { PAGE } > 4 { = { PAGE } - 3 } { PAGE } }
Press Alt+F9 to toggle on the display of the field codes and if you see
something like this, replace it with
{ PAGE }
The { } must be inserted using Ctrl+F9.
--
Hope this helps.
Please reply to the newsgroup unless you wish to avail yourself of my
services on a paid consulting basis.
Doug Robbins - Word MVP