Page jumps to bottom of screen

Hi There!

Hopefully there is somebody who knows why this happens on my website:

When I start scrolling down on my website, it sometimes makes a big jump, all the way to the bottom of the page (and skipping content). I only have this problem when I visit my website on a smartphone.

I think it has something to do with the responsiveness of my new theme (blossom pin pro). The developers haven’t come up with a solution.

Thanks for helping me out, I really appreciate it.

Lisa

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