One Page on load flashes row below slider

Hello there,

I am trying to use the “One Page” page with a slider, but every time when the page loads, it flashes the row beneath the slider “Create Professional Websites” just before the slider loads. Your demo does not do this.

I have tried Layerslider WP and Revolution Slider with your demo sliders and with my custom ones. They all do this. Do I need to set a height or something?

Thanks for your help.