Sticky menu does not work and content has shifted

Hi. I have such a problem. Has established subject. In the theme settings there is a function-to fix the sticky menu in the mobile version. After installing the menu worked fine. But over time, after my edits, it stopped working. In the code I do not understand, and the theme Creator does not support. Please help specialists. Code styles can in lichku send. And also, in theme styles, the content is shifted a bit to one side. I tried everything to change it, but it doesn’t work. Also please help.