Header only displaying half my text

[Sefton]

I have a first page header which needs to cover most of the first page, to hold text. I have adjusted the header height no problem.

But when I put text into the header, only about half a page's worth displays. The rest of the header below halfway-down the page , remains blank. Any additional lines of text I type in, just disappear. This is in Print Layout view. The text does not appear when I physically print the document either.



I am using Word 2010. I have saved the document as a dotm (template).

Can anyone help me? Is there a maximum header depth in Word 2010?

Thanks.