!!! Mobile view burger menu bug/faulty !!!

Dear dev, please fix this theme ASAP; when browsing with a mobile browser on android e.g. in the burger nav menu one has to precisely touch/click the “+” sign to navigate to the menu sub. I got feedback from users saying that the website is broken now because of this. They did not understand that only the “+” sign is link area, and thought a page/link is missing. This is a serious problem, as more and more users browse mobile and do not find the content they were looking for!

The page I need help with: [log in to see the link]