iAd get screwed up on ipad simulator - ios

Question

currently I'm trying to implement iAd in my universal iOS7 app.
This is working absolutly fine on iphone but on the ipad i get this screwed up ads but the bannersize is correct.
is this a known issue? or is there a ipad special implementation I didn't knew?
[edit!]
I'm pretty sure there is only one banner! its really just showing the normal iad ad in that weird way.
If I click on the ad, the fullscreen one is also not right scaled but its shown on the hole screen. Here is my implementation:
- (void)viewDidLoad
{
_adBannerView = [[ADBannerView alloc] initWithAdType:ADAdTypeBanner];
_adBannerView.delegate = self;
_bannerIsVisible = NO;
[self.view addSubview:self.adBannerView];
...
}
- (void)viewDidLayoutSubviews {
CGRect contentFrame = _mainNavigation.frame, bannerFrame = CGRectZero;
bannerFrame.size = [_adBannerView sizeThatFits:contentFrame.size];
if (_adBannerView.bannerLoaded && !_bannerIsVisible) {
contentFrame.size.height -= bannerFrame.size.height;
bannerFrame.origin.y = contentFrame.origin.y + contentFrame.size.height;
_bannerIsVisible = YES;
} else {
bannerFrame.origin.y = contentFrame.origin.y + contentFrame.size.height;
}
_mainNavigation.frame = contentFrame;
_adBannerView.frame = bannerFrame;
}
- (void)bannerViewDidLoadAd:(ADBannerView *)banner {
[UIView animateWithDuration:0.25 animations:^{
[self.view setNeedsLayout];
[self.view layoutIfNeeded];
}];
}
- (void)bannerView:(ADBannerView *)banner didFailToReceiveAdWithError:(NSError *)error {
NSLog(#"didFailToReceiveAdWithError %#", error);
[UIView animateWithDuration:0.25 animations:^{
[self.view setNeedsLayout];
[self.view layoutIfNeeded];
}];
}
And is there a way to show the test ads on a real device?
because I always get "Ad inventory unavailable"!