Strange issue while no anchor defined

[gmulliez]

while using on iPad ios 6.1.4 without anchor defined and with those options
[DDPopoverBackgroundView setTintColor:[UIColor darkGrayColor]];
[DDPopoverBackgroundView setShadowEnabled:YES];
[DDPopoverBackgroundView setContentInset:5.0];
[DDPopoverBackgroundView rebuildArrowImages];

I have a strange behavior on bottom of popover, extra dark space

my call to popover , myProductCollectionView is a collectionView nearly full screen:

    [self.currentPopover presentPopoverFromRect:self.myProductCollection.frame 
                                         inView:self.view
                       permittedArrowDirections:0
                                       animated:YES];

I hop it help, by the way this class is a model of simplicity and ease to use