This thread is resolved. Here is a description of the problem and solution.
Problem: The menu links are not working properly and when clicked, this redirects to the main domain.
Solution: In this topic, the client confirmed that synchronizing the menus again resolved the problem. To sync the menu, please, click on the WPML > WP Menus Sync to sync the menu again.
Relevant Documentation: https://wpml.org/documentation/getting-started-guide/translating-menus/
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