Unwanted white flashing on mobile

Hello! I was hoping to get some help with the mobile view of my website. Recently, I've noticed that when users go to click my hamburger navigation to open up the menu, the color of my banner flashes white, instead of staying orange. It used to stay consistently orange and looked very seamless when the menu pulled up. Does anybody have some advice or possibly know what section I need to tweak to correct this flashing? Thank you so much for your help and time.

My website can be found here, and I've also attached a screen recording of the issue on my mobile view!