Have you tried printing photos from your Android device (Samsung, Nexus, HTC, Sony etc) ?
http://www.hp.com/united-states/campaigns/mobility/#android-tab-new
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Some people have reported issues with skewed borders when trying to print 4x6 & 5x7 photos (see example below of correct photo size v's photo with skewed borders)
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If you run into this issue I would advise you to download the free HP ePrint APP from the App Store or Google Play, this allows you to print perfect borderless photos,
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Hope this helps.
I work for HP.
Carrie