Problem Description:

“my checkout page is showing the obox facebook version of checkout on my main site instead of my sites checkout page …. when you go from cart to /checkout/ ”

Note: the issue with the SC detection causing a similar issue has been fixed in 1.1.5. Please be sure to update your plugin.

Answer:

This issue seems to occur due to how cookies and caching are handled by your browser. If you visit your Social Commerce checkout page in Facebook, then go to a similar page in your main site shop, the Facebook layout will be shown as the cached layout.

To resolve, clear your browser cache and then access Facebook again.