Though this post is old, adding this info might help others looking to solve this issue.
This problem happens when you select entire table and enable "Repeat as header row at the top of each page" in table properties window.
Fix: Uncheck the checkbox "Repeat as header row at the top of each page" on table properties. Row break works.
To repeat the header on each page select particular row which you want to be repeated on each page and check the "Repeat as header row at the top of each page" checkbox. it will add header on each page with selected row value.