Loading Icon thumbnail on Facebook Share, JetPack

Hi everyone.

So I just installed the jetpack plugin for my site and added the Facebook share button to the bottom of my posts.

But when I tested it I got the loading icon as the image for my site on the shared link

img: https://www.pomtom.co.nz/files/wordpress%20fail.jpg

Does anyone know where it is getting this image and how I can fix it?

Thanks in Advance
Thomas

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