Xcode Orientation change shows unwanted in between state - objective-c

Question

I have a very strange problem.
I added orientation to my app for landscape and portrait without many problems and it works.
However, I noticed something weird.
When I keep my iPad "horizontal", meaning parallel to the floor, the view shifts in my window in a way that I did not define and it doesn't look good naturally. It shifts to an "in-between" state that I do not want (I don't know how to explain it otherwise).
Anyone experienced the same problem? And what is the solution to this problem?
For info: I used an observer on orientation change. I think this is where the problem occurred:
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(orientationChanged:) name:#"UIDeviceOrientationDidChangeNotification" object:nil];
I also used this code, but I didn't have problems with it before:
-(void)willRotateToInterfaceOrientation:
(UIInterfaceOrientation)toInterfaceOrientation
duration:(NSTimeInterval)duration {
[super willRotateToInterfaceOrientation:toInterfaceOrientation
duration:duration];
if (toInterfaceOrientation == UIInterfaceOrientationLandscapeRight) {
self.view=landscapeView;
self.view.transform=CGAffineTransformMakeRotation(deg2rad*(90));
self.view.bounds=CGRectMake(0.0,0.0,1024.0,748.0);
} else if (toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft) {
self.view=landscapeView;
self.view.transform=CGAffineTransformMakeRotation(deg2rad*(-90));
self.view.bounds=CGRectMake(0.0,0.0,1024.0,748.0);
} else if (toInterfaceOrientation == UIInterfaceOrientationPortrait){
self.view=portraitView;
self.view.transform=CGAffineTransformMakeRotation(deg2rad*(0));
self.view.bounds=CGRectMake(0.0,0.0,768.0,1004.0);
} else {
self.view=portraitView;
self.view.transform=CGAffineTransformMakeRotation(deg2rad*(180));
self.view.bounds=CGRectMake(0.0,0.0,768.0,1004.0);
}
}
Thanks!