In mobile view, I found that there will be a white bar occurred above menu in IOS chrome, after click “scroll up” buttom.
This problem happened to my just-finished new website. So I tested on two newly imported templates “Driver” and “Security”, and they both have this problem. Sometimes wide, sometimes narrow.
i only see a white space if i scroll down the page and then scroll quickly to the top of the page. Which is Chrome showing the body background. This happens on most sites. Check wordpress.org it too does it. And to note: its to do with the Browser
But that spaces disappears for me. Is it not for you ?