Twenty Thirteen responsiveness

Hello All,

I’m using a child theme Holi (based on twenty thirteen) on my website : http://www.vespaclubgelderland.nl on my pc screen all looks as I want it. However when I view the site on my iPad all is as expected in portrait mode. Widgets are in the footer. But when I turn the iPad to landscape I would expect that the widgets are on the right side of the screen but my view is as in portrait.

I validated the view in safari and set in the development menu the browser to iPad and also with responsinator in both occasions the view is as expected.

But why is the view incorrect on my iPad in landscape mode ?

Best regards,

Jacob