Two kinds thumbnail of link shared on facebook

Hello,

This is how link looks like when I share something on facebook
https://img.janforman.com/Snimekobrazovky20150731v20.13.41lw8k.png

and this is how it looks on website damnlol
https://img.janforman.com/?id=Snimekobrazovky20150731v20.13.532bnk.png

it’s the same picture but two different styles of thumbnail – do you know how can you change this ?

Thank you