Hi Elise,
sorry for getting back to this issue, but I’ve tried to create a header with Elementor but that’s not offering the same feeling I like of your theme (Chapeau, it’s really awesome!). That’s why I’ve dropped my already paid premium Polylang plugin and purchased the WPML to comply with your theme, which gives me a hard time finding all my strings to translate (pain!).
However after switching the translation plugin the problem with the occasionally missing desktop header in one of the two languages remain. And I do not have any idea why. As in the screenshot you can see that the header itself is actually there but the content is not showing up. Any idea what could cause that behaviour?

I’m running Woodmart with Elementor Pro, WPML and Breeze for caching.