@MechMan
There are 8 screws with the Expedit shelf. If you do not screw them in this can happen.
The 5x5 space shelf is 185cm x 185cm x 39cm and weighs 92.8kg. If you use the 8 screws you will not see another scene like the image above. Unless you use force and lots of it.
If the screws got lost call Ikea. They got everything.
-Mikkel