I believe i found a bug on WPML language selector on Header 7 style
Language WPML selector work perfectly with all others Header.
You can’T click on drop down menu second language, issue append on any header 7 alignment.
Look like Z-index is incorrect and also the alignment is to much the right and the .lang-sel is somehow croped
As we see on our dev site the WPML language switcher works without any glitches.
We need to check your site properly to define the reason of the problem on your side.
Please, kindly mail us your request and WP access details to your site to [email protected] and we will be able to help you.