At using share function via LinkedIn API, one and the same picture is transfered for each page of the website http://hrm.mysitedemo.co.uk
The picture is cached on the s
Try passing the &summary="Your short description" in the url, as BBC does:
https://www.linkedin.com/shareArticle?mini=true&url=http%3A%2F%2Fwww.bbc.com%2Fnews%2Fworld-europe-35602288&title=Ankara%20blast%3A%20Turkey%20PM%20says%20Syria%20Kurds%20to%20blame&summary=Turkey%27s%20prime%20minister%20says%20the%20deadly%20bombing%20in%20Ankara%20was%20carried%20out%20by%20Kurdish%20YPG%20militia%20based%20in%20Syria%2C%20and%20nine%20people%20have%20been%20arrested.&source=BBC
This way it wont look to load it from your page's OG tags and it wont get cached. Worked for me