Off Canvas Menu not working

Hi,

I have a number of sites that I use GeneratePress on and on the others this seems to work fine. For a reason unknown to me it is not working for this domain.

My main menu uses drop down which works as expected. I don't like the way drop downs work on mobile screens though so I normally create a mobile menu as well that lists all pages without using drop down and save this as off canvas. For this domain however I still see drop down menu on mobile.

Any ideas? I might just get rid of drop down menu and use same for all devices because I actually have enough room to display them all (unless the client suddenly demands a few extra services).

Gary