Resolved.
My friend had a look at the code.
I linked to the ng gallery on my page with this: [nggallery id=1]
WordPress added in some tags like this:
<b>[nggallery id=1]</b>
(I had to view on ‘text’, not ‘visual’ on the page to see this).
Which bumped everything down a little.
With the
and <b> tags the images align,