Some feature images have the wrong size

Hi there. For some reason some of the feature images of my posts pushed to Buffer are getting cropped by Hypesocial Pro.

I opended a ticket with Buffer and they told me that they are receiving the images already cropped. Maybe there might be certain algorithm that crops certain images to squares not the others.

Here are the samples

Twitter – Correct image size on posts samples ??

https://t.co/QMxlT1cErv #aeroporto #apple #guarulhos #review #store #terminal pic.twitter.com/TKUxSCeaRd

— Reanderson Silva (@silvareanderson) September 29, 2016

https://t.co/1gyrM9mBAu #aeroccino #café #coffee #espumador #leite #nespresso #review #whatelse pic.twitter.com/My7xISlBsb

— Reanderson Silva (@silvareanderson) September 29, 2016

Twitter – Incorrect image size on posts samples :'(
https://twitter.com/silvareanderson/status/780920179702325248
https://twitter.com/silvareanderson/status/781856428885549056

Facebook – Correct image size on posts samples ??

Facebook – Incorrect image size on posts samples :'(

Can you guys help me to identify whats causing the trouble?

Regards.