Mobile nav issue with the line over the "Back" text

Site URL: https://www.billry.com/

Hi there! I'm having issues with making the entire navigation visible on mobile, more precisely, when I click on the hamburger icon it's ok, however when I click on the navigation item, the "Back" text is covered by something, not sure what it is. I tried changing the color, tried moving the nav left and right but nothing. Can someone please help? Thanks!

Edit: the website is made in Brine family template, Impact