Hi, your mobile menu, which appears on desktop at certain browser sizes, is not styled properly. It extends to the right, so if a browser is on the right side this means the menu is off screen. It should extend to the left, instead, since the button is on the extreme right of the window. Proper design dictates that web page elements remain within the confines of the browser
This is probably an easy thing to fix, and in it’s current state it is very annoying.