Mail Merge page numbers issue on 1st page only

Hello,

So, I am merging multiple excel rows together in excel. I have 5 sets per page using next record.

I added:

page { SECTION } OF { NUMPAGES  }

To the header and the result for three pages shows 1 of 1 for 1st page, 2 of 3 for 2nd and 3 of 3 for third.

Any suggestion how to get the first page of the resulting merge to show the correct number of pages (in this case 3)?