Nav bar style breaking

I noticed that our site loads normally then after a second or two the navigation bar changes color and size. When I deactivate this plugin, it’s fine. Please advise. I see this in the code when the plugin is activated.

style="background: rgb(103, 122, 139) !important; transition: all 0.5s ease 0s;" data-data-uw-rm-color-contrast-styled="true" data-uw-rm-color-contrast="afix"

The page I need help with: [log in to see the link]