Logo not visible on mobile despite retina logo upload

Hi Minti,
great theme!
I am looking to launch our new website next week and the only outstanding issue is that the logo does not display on mobile. I have uploaded the required logos in the required png format and with the relevant specs but still does not show. I have also deactivated all plugins but still does not show.

Can you please help? (URL and password with next reply)

Thanks
Max

Ticket