Menu sub items not displaying

Hi – I updated the EDIN theme this morning as I’m using the Goran theme on my website at https://mydp.uk/cooperandleatherbarrow.

Since doing so, the sub menu items (the ones in the drop down) don’t work. Is there a fix for this – checking the wordpress.com forums (here https://en.forums.wordpress.com/topic/goran-submenu-disappeared?replies=8) it sounds like this issue appeared on wordpress.com and got resolved, without any details of how/why.

Anyone help?