Does it work if you do what I said
<h1>Cues! the GMDF Newsletter</h1>
[show_posts filter=cues-header]
<div style=”clear:both;”></div>
A very important aspect of the Federation’s services is the publishing of its newsletter called Cues! It is issued on an “as and when required” basis.
Cues! is distributed via email to all member societies, as well as a wide range of individuals and companies associated with theatre and just as importantly
Because mixing text and a shortcode that floats stuff is a recipe for problems, so you should definitely have a clear separation to control the layout