I created a mail merge in Word with some pretty complicated word fields in
addition to the merge fields.  

In the data source I have four sets of fields with the same type of info
that are numbered.  

i.e.  name1, address1, phone1
name2, address2, phone2
name3, address3, phone3
name4, address4, phone4

Now here comes the weird part.  When I use only the first two sets of data
fields in my document everything is just fine, but when I try to add the
EXACT same merge fields for the third or fourth set of data fields, the word
document acts as if there is something in the third field even when it is
blank.  

More specifically, I asked it to insert certain text if the field is not
blank and it inserts that text even if the field is blank.

Now here's the even weirder thing, if I only add two sets of data fields and
no more, everything works fine.  It doesn't matter which numbered sets of
fields I use as long as I only use two of them.  As soon as I add a third set
of the same fields (with a different number) I get the same result.  So it is
not like it corresponds to only the data in the third set of fields.  The
error seems to correspond to whichever set of fields I place third in my
document.

Please let me know if anyone has any idea what the trouble might be and how
I can fix it.