Safari Menu Issue

Not sure if this is the right place for this.

I’m having a strange issue I’m having trouble resolving. On Safari the header gets messed up when the menu is open. I’ve tried Change the min/max widths to 100% and a few other things but nothing seems to give.

If anyone has an idea of what’s going on it would be appreciated!

Here is my site Read-Only: LINK
(how to share your site Read-Only link)