If you have an AMP WordPress website and Calculated Fields Form (CFF) plugin, you may be aware that your forms actually don’t load on the AMP pages this is a cause for concern with user’s experience resulting in them leaving.
After viewing a few of my posts that contained forms I noticed it was caused by the Calculated Field Forms plugin itself. The plugin would try to redirect AMP pages to a HTTPS link. And since I do not have SSL enabled on this website as there is no reason to, this is not good for users visiting posts that have forms.
After trying to search for fixes I stumbled across a very unhelpful post by the plugin developer themselves. Not satisfied with this I set out to fix the issue myself.
All it took was a simple small edit of the cpcff_amp.inc.php from the Plugin Editor.
How to fix
From your WordPress Dashboard navigate to Plugins > Plugin Editor
From the Plugin Editor page select Calculated Fields Form from the drop down list of plugins to edit.
Open up the cpcff_amp.inc.php file from the Plugin Files sidebar.
wp_redirect( “https://$host$request_uri” );
wp_redirect( “http://$host$request_uri” );
Once you have made the change click Update File to save the changes.
NOTE: You will need to do this again every time you update the plugin.