Demo slider and code on Home Classic

Hi, I purchased the Multicorp WP theme and uploaded the demo content. The theme looks great, I love it! But I’m having trouble achieving the animated slider on the HOME CLASSIC page. And I haven’t been able to find out how that is controlled. My site is not fully live yet, but the URL so you can see it so far is: https://kdimages.com/wp/
Note the code that appears to the right of the “Discover More” button in the clouds video bar. I have no idea what that is, it just appeared when I uploaded the demo content.

In addition, the button on the demo page sometimes is hidden by the header. I likely don’t want a button element there for my site, but I would like to understand why it’s not displaying properly so I can problem solve on my own.

Thanks in advance for your help!