Menu on iPhone issue

I have just updated to version 2.0.2 and was pleased to see that the update addressed the issue with the menu on smaller devices but it is still not displaying correctly on my iPhone. I recently purchased this theme and am trialing it out on my own website at https://www.domainline.co.uk/ before using it on some of my customers sites. I accept that my site does not show off all the features of the theme, but I am using it to become familiar with possible features etc. Anyway, could you please provide guidance on the menu issue please? Many thanks, Chris