Recently upgraded to Pro – background color of slider changed

Hi! I just upgraded to Pro, and even though I'm using a child theme, it looks like the background color of my slider is now defaulting to black. When the page loads, it's the proper color (#89b59d), but after about a second, it flips to black. I'm not sure why or how to change it so the proper color sticks. My site is www.WorkatHomeFAQ.com. Any advice? Thanks!