Somewhere there is a comment (maybe a forum posting or in help but can’t find it right now) that the blanks lines are necessary to stop Word joining tables together.

Melson is right – we add an extra line to stop one table from joining itself onto a following one.
We have looked at this several times, and we think whilst doing it this way does add extra lines occasionally, it is more reliable at creating a sensible-looking document. All the alternatives had bad side-effects in some circumstances.

Use the Word ‘outline’ view to see which Word Paragraph Style eaDocX is using for this header. Then check the styles used before it.

That text is in an ‘invisible’ style – one which will not print.
You can stop seeing it in the eaDocX/Word window by choosing eaDocX / Tools / Hide/Show section Marks.
There is no supplied Word template – we assume that you are already Word users, and will want to use your own styles and formatting from your own Word templates.
All you need to do in eaDocX is to say which of your Word paragraph styles eaDocX should use for which bits of your document. Some stuff is built-in, for example, heading 1..Heading6. Everything else will use your ‘normal’ style, unless you configure something else.
It’s all in the help…