Hello,
I am sure that we could do this together... In order to give you clarity on the process, I would want you to give me specific detail about the plugin that you are using, and the both the wordpress versions.
In order to fix the issue, I would need the access for both the sites, and the code, in which I will identify the issues, and then will let u know how can I fix that.
In case you have any question, please feel free to ask..
Thanks and regards,
Vishal Singh