thumbnail image shared

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Hi, I am using pro blog plugin on concrete5 - 5.6.3.4 and pro blog
when I share article in facebook, it sometimes share the thumbnail image, sometimes share the image posted on the article and sometimes share the logo image.
How can I do it so it always share only the thumbnail image?
You can check the website here and test it yourself
http://acute.fi/index.php?cID=189...
Thanks

Type: Discussion
Status: New
gotemperor
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concrete5 Environment Information

concrete5 - 5.6.3.4

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