Responsive layouts missing elements

Hi - Couple of things:

- I am trying to set up my mobile responsive layouts but when I go to edit them, the headers and header text are missing but there are giant gaps I cannot close (see

- Trying to edit the mobile nav bc the font is really small, but it's shifted over (see attachment)

- The video on my home page is making my home page mobile layout shift over. I thought that had been fixed but it is not. When I edit the side of the video in mobile, the video in the web layout changes too. The web layout video should remain the same size but the mobiel layout should reduce the video size to align everything correctly