Can’t scroll down on website

Hi
I have installed the onepress theme on my webpage. I have two versions, a test-web (test.pr….) and a real version (www.pr…), same theme on both. The test version works great. But on the other I can’t scroll down. What should I do to be able to scroll as usual?
If I mark the page I can see the entire content. But otherwise it’s “locked” and shows only what’s on the screen. I can switch between tabs on the page but can’t scroll down on anyone.
I have the same settings on both sites as far as I can see…

How do I solve this?

The page I need help with: [log in to see the link]