Old non-exisiting page shows up

Hi there,

It's a mystery: - this page should show dates for 2017 only.
What it does, it shows a page from last year. I even delete all the old revisions of this page and if I check with SQLpro, there is no more text with 2016 in it.
Now the funny part:
Locally it works, I get to see the new content. Remotely I see the old one. I tried from different networks. It looks like a caching problem, but there is no chache inbetween.
...now I'm running out of ideas.