we are experiencing problems with WPML. After activating a FR language version (which has not yet been implemented so far) I receive a lot of problems.
When I am using the default German version and create a new blog post, it creates the new blog post in FR, but not in DE.
When I add a new item to a EN menu, it always tells me I am in an FR version adding something but I am in the EN version.
Thanks for contacting WPML forums support. I'll be glad to help you today.
First of all, sorry for the late reply due to a higher workload. I checked the staging site and found that the issue doesn't happen when using your parent theme or WordPress default theme, so your child theme causes the issue.
Currently, the parent theme is activated on your staging site. Please try to create a new post and let me know if it works correctly.