Really

Problem:
If you're experiencing issues where slugs for translated content in WPML disappear about 30 minutes after being set, leading to redirections to the home page, this might be due to a conflict with the Event Manager plugin. This problem specifically affects the second site language, while the main language remains unaffected.
Solution:
We recommend deactivating all plugins on your staging site and then trying to reproduce the problem. If the issue persists, reactivate the plugins one by one to identify the conflict. According to a support thread on the WordPress forum (https://wordpress.org/support/topic/wpml-issue-with-eventsmanager/), the Event Manager plugin might be causing the issue. Until an update is available, you could consider downgrading or amending the plugin file directly as a temporary fix.

Please note that this solution might be outdated or not applicable to your specific case. We highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If the problem persists, please open a new support ticket at WPML support forum for further assistance.