code appearing in header of about page only

Hello everyone!

This code appears on the header of my About page only, and nowhere else. The crazy thing is I was looking for the code to delete it from my code injection and CSS, but couldnt find it anywhere. Instead, I ended up clumsily deleting all my CSS codes (will deal with that later). 

I want get rid of that code from the header on the About page. Please help! I know nil about coding..

Thanks so much! Job done!