Menu in greek language shows only XXXXXXX characters

Try this tutorial, this will help you fix the issue: https://ampforwp.com/tutorials/article/troubleshooting-the-problems-with-the-menu-navigation/

Thank you for your suggestion. I’ve already tried this without solving the problem.

I just visited your site and the menu shows the correct text.

Nice to see that the issue was fixed for you. Please share the solution with us for it shall help the others.

The problem solved as soon as I created a new bottom amp menu and saved settings!