Mac App Store problem

I'm putting the iPad version of my game Repeeto on the Mac App Store but I've got one problem.
The iPad version is 1024x768 and from what I've read I can use that for the Mac store too. I've published from GameSalad to make a local copy only for testing and I've noticed that although the width is still 1024 pixels there is a black vertical gap of about 20 pixels on both the left and right side, meaning my actual game has been squashed on the x axis. Its noticeable because all the images are slightly blurry.
Anybody know why I'm getting the black borders ?
The iPad version is 1024x768 and from what I've read I can use that for the Mac store too. I've published from GameSalad to make a local copy only for testing and I've noticed that although the width is still 1024 pixels there is a black vertical gap of about 20 pixels on both the left and right side, meaning my actual game has been squashed on the x axis. Its noticeable because all the images are slightly blurry.
Anybody know why I'm getting the black borders ?
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