I made the change you suggested and I like the way when you click a menu item and the page scrolls down, the menu closes automatically. Did not expect that but it is a nice feature.
However, I still get a usability problem on phones only, not iPads or computers. If you get a chance could you have a look at it on a phone and suggest a fix to this problem – when you click the navicon, the menu slides open nicely, then if you click a menu item, you can’t immediately click the navicon to open the menu again, you have to move the page a bit.
Also the navicon bar disappears on the samsung phone after you click a menu item.
Would be grateful for some suggestions on how to fix these usability issues. Thanks for looking.