Thank you very much for the proper details, it helped me a lot!
The problem, that you are using an outdated version of the plugin, which did have an issue pairing WPML languages in some cases. I have corrected the problem directly via the FTP details, in case you prefer not to upgrade to the latest release.
Now it should very likely work correctly in all languages.Best,
If you like my products, don't forget to rate them on codecanyon :)