As Anne said, the table could be split by a paragraph mark. A section
break or a manual page break would cause the same effect. Delete the
paragraph mark (section break, page break) to merge the two tables.
If you want a page break inside the table, instead do the following:
Select the row which should go to the next page. On the Format menu,
click Paragraph. Click the Line and Page Breaks tab. Select the option
for "Page break before", and click OK.
Also remember that repeated headings must be at the top of the table.
You can have more than one row, but they must be consecutive rows (no
"gaps" allowed).
