Sharing on facebook looks strange

I don't know why some posts doesn't show the the featured image and the title/text, when I try share them on facebook, for example.
Could you dive me some feedback about it?

For example, if I try share this post, everything will be ok:
http://www.canalbiociencias.com/primeiro-teste-clinico-com-celulas-tronco-ips/

If I try to share the homepage or other post, it'll be strange:
http://www.canalbiociencias.com/
http://www.canalbiociencias.com/neuronios-novos-todos-os-dias/

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