So far you've only mentioned one mergefield, but you have what appears to be two results separated by empty lines. What kind of merge are you doing? if it's a directory/catalog merge, try deleting the paragraph/line breaks before/after the mergefield and using the /f switch. For example, suppose your mergefield is «Data». Selecting the field and pressing Shift F9 will reveal:
{MERGEFIELD Data}
If you edit the mergefield code so it appears as:
{MERGEFIELD Data \f "¶
"}
(where ¶ is a pargraph break) it will insert a paragraph break after the mergefield if the field is not blank.

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]