Thank you for contacting WPML support, I'd be happy to help you with this issue.
It is possible the redirection is implemented by the plugin "Redirection" on your site. You can try to disable this plugin or enable a minimal environment as below and see if it helps.
- Deactivate all non-WPML plugins
- Switch to a standard theme of WordPress
However, when checked, the redirection is being made by WPML and not our redirection plugin. We tried looking in all our set-up as well if we had one for this but there's none.
I would like to request temporary access (wp-admin and FTP) to your site to take a better look at the issue. It would be better to a testing site where the issue is replicated. Your next reply is set to private to share the info.