My Drop-Down Menu does not work and i cant figure out why

Ik the Layout is still messy… But i really need help with my Dropdown,
I even tried to replace it with a new Dropdown from the Toolbox but the
same problem occurs.
Does anyone know what might be the problem?):

Here is my site Read-Only:

Hi @Stella_Flury

Can you describe/show the effect you are looking for?