The drop down menu for language selection overlaps on mobile devices. Font too large and orange. I don't know how to adjust this. It used to be in the hamburger menu.
It seems that there is a language switcher inserted directly on the main-header, on the mobile view. WPML does not do that by default, so this must have been inserted manually.
Please check if the header was created with Divi, if the language switcher is there. Also, since you're using a custom child theme, talk to your developer to see if there's a custom coded switcher there. Let me know your results.
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Now, WPML allows you to add Language Switchers to your menus, footers, or templates, regardless if they're mobile or not - this comes from the theme. You can find the instructions here: