Hi @lvandeemter,
Thanks for the clarification, hence, the real issue is empty page builder and not just some missing elements. But I do like to give my initial investigation on why I couldn’t provide an answer to the issue.
I just based my initial investigation based on your provided information.
- Page comparison
you can compare it with the Dutch HOME page - what it should look like
But please check this video recording, https://www.dropbox.com/s/7ol6rijbdsfk82z/bandicam%202018-10-20%2002-51-44-242.mp4?dl=0. Nothing is similar on both Dutch and English
- The presented issue
Some elements are gone.
Not some, but totally empty as your screenshot.
I checked your English and Dutch home page and they looked different so I just thought the content is just overwritten. What I’m asking is just clarification as I’m not really sure what’s not working since there is a content, just different. Maybe I used a bad wording when I asked it, but not’s the tone I’m trying to convey, maybe that’s just how I converse with my friends 
Though, I’ll be more happy to help you and find what’s going on. I just need a starting point of what to check as I’m not really sure what’s going on. Again, as for clarification, your English and Dutch page are really different but with just empty content in the builder, right? I just assumed the content is supposed to be the same, just translated but being corrupted by another content that I’m seeing.
Do you still have the copy of that page as a backup? This doesn’t look like WPML related since it has no capability to change the content (since it’s the user that do the translation manually). I’m afraid, the only way to make this work again is to manually create that page. The builder works without any issue, it’s just that the data is corrupted. OR, if the English page and Dutch page are really the same (since it’s what it should look like), you can save the Dutch page as a template and import that template to the English page, and translate it again.
May I know when this issue usually happens? I can’t reproduce this issue on any of my installations. And I don’t see any other threads about WPML causing data corruption in the builder. Possible with preview loading issue (data are still intact, just won’t load), but not the data corruption (the preview loads but empty).
Thanks, again, sorry for the confusion.