Incorrect image appearing on a shared link

Hi

I have created a new blog post today and began to share the post in a number of networking forums I belong to on Facebook.

I shared the post using the shortlink but found a totally unrelated image showing next to the snippet I was posting.

I then deleted this and used the long url link but still the incorrect image appears.

The post doesn’t contain any images however, the image being picked up relates to a testimonial in the widget on the bottom right of the page.

I am very confused as to how this is being picked up from the media library or the testimonial on the page. I have looked at the widgets/media library and nothing seems to be out of place.

My website is http://www.jlbsupportsolutions.co.uk and the blog post link is http://www.jlbsupportsolutions.co.uk/25-back-office-tasks-need-outsourced/

All advice gratefully received.

Thanks

Jo