Superfish (v1.7.5) menu stays open on iPhone 6 only - and only when you return to the page you opened it on

Superfish (v1.7.5) menu stays open on iPhone 6 only - and only when you return to the page you opened it on

Just downloaded latest version today, all default options, no tweaks except one: I have changed the href to "javascript:;" for the link the opens the submenu. Page is here: http://www.j-c-associates.co.uk/blog/
Test steps are as follows...
1) tap 'not a link - reveals' to open submenu 2) click link to go to http://www.j-c-associates.co.uk/blog/tag-2 Menu is now closed on all devices. However... 3) click 'back to blog home page' to return to initial page On iPhone 6 (I am advised) the submenu is still open. I can't find a 'close all submenus when page loads' option - indeed, I would have thought that would be the default. I have next to no jQuery knowledge.