Device orientation iPad

Hello,

In first time, sorry for my english expression.

I have an application on iPad3 with ios version 7.0.6. This application work correctly.

Recently I received an iPad Air, and mini. Their ios version, is 8.0. My problem : When I use my app, compiled since a Mac on iPadAir or Mini, my device orientation is considered like this "portrait = landscape". The same version of my app compiled on iPad3 works correctly ! (I have test my app, with a lot of different parameter, without success ...)

So, I need help of community ! My problem is link to ios version, material (iPad3, Air, Mini), my app, or other ?

Thanks for your future response !

PS : I appreciate the answers in french ;) !