Background on load animation gets stuck

Hello! :)

When I check my page on an iphone or ipad the dark grey background in the loading animation between pages often get stuck on top of the page.
It happens when I go from the main page (“home”) to a post, and then click “back” in the browser. The browser jumps back to the main page, as it should, but the grey background does´nt disappear when the page is loaded. Instead it´s just stuck on top of it.

How can i fix this? I know no coding or such…

Thanks! :)