Strange. That's the default cordova icon. Looks like the XDK is still using a size that's not a default on the iPad/iPhones.
Try this:
Rename the IPA that you download from the XDK to a .zip file.
Open the zip files and take a look at the folder \Payload\YOUR.app\www
That is where your icons and splash screens are stored within the app. It might give you a clue which one is using the wrong icon.
As a comparasion, in my config.xml within the IPA file, the icons for a landscape iOS app are like this:
(/resources folder is where I put the icons, it will be different for you)
<icon height="180" platform="ios" src="resources/Icon-60@3x.png" width="180" />
<icon height="120" platform="ios" src="resources/Icon-60@2x.png" width="120" />
<icon height="60" platform="ios" src="resources/Icon-60.png" width="60" />
<icon height="152" platform="ios" src="resources/Icon-76@2x.png" width="152" />
<icon height="76" platform="ios" src="resources/Icon-76.png" width="76" />
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