External links from facebook posts break reCaptcha

Hello, I have a photography website with recaptcha on the message form. Recaptcha seems to work great if I load the website from URL, Google, Google Plus and direct links. The problem is with the Facebook app. If I post a link to my page in Facebook and the I click on it, when the page opens recaptcha says "Error: invalid domain" and doesn't load. Have any idea what might be causing this? It awfully strange. The link posted on Facebook is the same I would load in the address bar. Doesn't Facebook just open chrome on android and load the same URL? I was thinking this may be caused to recaptcha checking from previously visited pages, but I'm not sure. PS: it only occurs on posted links on facebokk. It doesn't happen on links that are scheduled to be posted or not yet posted (even stranger). Thank you for any help on this.