I have an issue with my website stellaoslekova.com. There are some drop down menus on the first, second and third menu point. As a contact form I use the modul "Responsive Contact Form", it's in a content. If I go to contact (the last menu) it's working fine, but the drop down doesn't work... Also on the iPhone the completely responsive menu is gone. Is there some JavaScript problem or something like that? Do you have any idea how can I solve this issue?

Thank you!