"Auto publish post" field not updating once changed

I’ve noticed that if you change the “Enable auto publish post to my facebook account” option when editing post, it cannot be changed again afterwards, i.e. my client changed this to “No” as we have been having some issues with the plugin. I then changed it back to “Yes” but after saving the changes, it had reverted back to “No”.

https://www.ads-software.com/plugins/social-media-auto-publish/