I see you have 3.5.9 installed. Ok updating probably wont change anything.
Can you create a page where i can see the error and then email the page address to me to info@laytheme.com and a link to this topic
You are using this Custom CSS suggestion from @Mariannep?
If you post a link to your website i can check for a simple fix, the above code should work. But the menu-item # (number) will be different for each website.
