Section #01 in Catch Fullscreen shows just white

Dear Support I'm having issues with the landing page of my website. When i scroll down the first section just shows white and nothing else. I don't know how to get rid of it or where to edit it. From Section #02 onwards they are all showing correctly. I'm using the Blog Posts for this. My site: https://siriawalker.first-floor.ch Thanks for your assistance. Siria