while Front page loads, the second section appears

this happens only on the front page. while loading the image, the second second appears instantly, so the page appears broken. we also noticed it on your demo, so its a theme issue. https://catchthemes.com/demo/catch-fullscreen-pro/ what can we do about it? is there a quick css or js fix for this? we'd loke to avoid solutions like those annoying page loaders that dont show the page till is loaded.