I am not able to make the Plugin work on my site...

Hi, I installed the "Pay with a like Plugin" and I am trying to make it work. But the content I add between the shortcode is displayed right away, without the Pay with a like.

It happens for example ob the URL http://sachainchi.info/demo/

It would be awesome if someone can give a look and help me find the issue... Access to the site is granted already.

Thank you