Wrong responsive Image loaded

Hi all,

I’ve got a problem concerning responsive image scaling/versions on my site:

Read-Only link

I put images in the “Step Section” container and spanned them over both cells with a min width of 100%. They are both 4000*2000 pixels. When I publish the site and look at it in Chrome on a HD Monitor the picture in the section about “Dreh” (me with my camera) is displayed correctly, but the image in “Schnitt” (below that) - which has the same dimensions and styling - is blurry. I inspected the element and it seems, that the website loaded with the 800px variant of that image:

noordwind-filme.de/process

Password: WebsiteRelaunch2019

What did I do wrong? Both pictures are identical but load differently…


Here is my site Read-Only: LINK