Hey Martin, your two images have been offset to push them off-screen left and right, respectively. This blows out the size of your container, which affects everything else in the container, too.
In theory, the easy way to fix it would be to select the immediate container of your 2 images and set overflow: hidden.
However, I’ve just checked and in a quick stack element, cells do not give you that option.
I think for you here, quick stack is probably the wrong tool for this particular layout, and you should go with flex and grid instead.