Using the menu “Seitenhöhe an Inhalt anpassen” or “Fit page heigth to content” messed up the order of some elements (Layout blocks and groups) on my pages.
I reduce the problem to one single page from scratch (default 960 px, no devices) without any hidden elements. Attached the view of the correct (left) and disorderd (right) page with zoom 10%.
That feature will place all the “Move with page bottom” elements after all the ones that are not “Move with page bottom”. This essentially moves the page footer below the main page content.
Perhaps you had some element accidentally set as “Move with page bottom”.
