Dropdown Menus Flickering

[CFHcricket]

Hello! I am new to Shopify and am trying to fix an issue with my dropdown menus.

When you hover over a dropdown menu in the top header, the flicker as you navigate down the menu.

I've searched through previous discussions and YouTube tutorials to fix, but have had no luck. From one suggestion, I've edited the menu distance from the header itself by adding the below to the end of the base.css and it did not fix the issue. 

1. .header__submenu  {
2.   top: 30px !important;
3. }

My website is killintimeracing.net (03b979-56.myshopify.com); password is 521.

Video of issue is attached. 

[vm-web]

@CFHcricket 

I have checked your site, but I couldn't find the flickering issue of killintimeracing.net. You have a change currently on site?

[CFHcricket]

Hello! I changed to a different menu option. I never found a solution to the flickering dropdown menu. Thank you for following up!