OK, that broken code is fixed now, and the problem is still there. O well, it needed fixing anyhow!
So to fix the layout, you need this:
.nav-link-container {margin: 0;}
in your mobile styles, as it’s the margin on the nav that’s causing the problem. But do you want that Home link or not? If not, you could just hide the whole nav and be done with it. E.g.
.nav-link-container {display: none}
in your mobile styles.