this issue happens because of static header option. As you don’t have a lot of content but the page is full screen, the script can’t calculate static header position. As you basically don’t need this option please open your include.js file, go to line 26. You will see comment for static header code. Please remove it. Also at the bottom of the file, line 248, there is also code for static header. Remove that also. Let me know if this solved your problem and if you need anything else.