Removing sub-headers from excerpt

Is it possible to strip a sub-header from an excerpt? It seems that when a blog posts to our website, the shortcode that I used, takes the sub-header of the blog and includes it as part of the excerpt (with the first paragraph).

I am using [display-posts wrapper=”div” include_excerpt=”true” excerpt_length=”46″ excerpt_more=”Continue Reading >” excerpt_more_link=”true” post_per_page=”1″]

Thanks,
Liam