Responsive menu problem

Dear support,

I have a question about the mobile version of the template. I managed to fix the menu button so now it is floats on the top all the way scrolling down and up.
Problem is, when I click the menu button and the drop down menu appears. When I select something from the menu, the it takes me to desired section, but menu stays open. Can you help me how to make it close after I select something from the menu?

Link to website : https://prc.sk/
Thank you