iOS responsive web app not follow orientation change

I am new developer, developing a hybrid iOS universal app for both iPhone and iPad, the app name is "Bellydance Festival", version 1.0. The content is loaded from responsive website and I allow app rotate orientation, it is all working fine. now I continue developing version1.1 and I didn't know what I changed and now when I rotate the view, the content is not responsive anymore. I'm sure the problem is not from website. please help. Thanks

the responsive website is http://ift.tt/1BtdQv9