W3 Cache Glitch on page refresh?

Hey guys. I am noticing that on my page refresh or when I navigate through the site, it’s flashing some funky HTML at something at me. A bit buggy. Any idea what that may be?

http://js-interactive.com/
If you cliock through the site, you’ll see what looks like the DROPDOWN menu rendering in the upper left corner in html. Not smooth.

Thank you
Justin

https://wordpress.org/plugins/w3-total-cache/