Issue preloader icon rotating-plane on Safari

Hello and thank you for your plug-in,

There is a little bug on Safari 10.1.2 (El Capitan operating system Mac).
When I use ‘rotating-plane’ preloader icon, the preloader never stop and the text at the foot, the Next/Preview arrow are strange.

You can see the issue here.

A screen capture

Best regards

The page I need help with: [log in to see the link]