White space above menu header on mobile

Hi there,

There is one bug on my website I don't seem to be able to fix.
I'm finding a white space, or white banner at the very top of the mobile pages, that is cutting my menu header.
The weird thing is I can't seem to find this white thing in the dev tools, and it appears on all pages except the home & news pages.

Are you able to see the glitch and understand what is happening?

I have a feeling it's something obvious that I didn't see but I'm so stuck right now, hope you can help me out!