OK, looking at the css through Chrome: Apparently each row/DIV that has been assigned a class that corresponds with the menu, has been set to “position: absolute” and “top:0”.
The rows do not inherit these qualities through an actual CSS stylesheet: these are added dynamically to the element style by processes on the page itself.
I have been able to “counter” this by listing all the rows manually in CSS and basically writing “position: initial!important” and “top: initial!important”, but as you can understand this is a less than ideal fix.