This thread is resolved. Here is a description of the problem and solution.
Problem:
You are experiencing an issue where the layout of the header on the translated page is incorrect, making the menu invisible, while the original Dutch page layout appears correct.
Solution:
We recommend deleting the problematic English page and re-translating the 'About Us' page from the original Dutch version. This approach resolved the issue in a similar case by removing the corrupted page that was causing the layout problems.
If this solution does not resolve your issue, or if it seems outdated or irrelevant to your current setup, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the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 problems persist, please open a new support ticket.
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