Sprite sheet iPhone 4 issues

Hi. I have a sprite sheet that loads in my game, nuclear chickens. As you can see from the image below, I never quite figured out the dynamic resolution for the sprite sheets, help with that is appreciated too.

I have tested this game on every virtual platform corona offers, and it looks fine. I tested it on my iPad (the only device I have) and it works fine. I had a guy test it on his iPhone 4 running 4.3.2 update, and he sends me the screenshot below.

It appears like this when the dimensions are off, is there something I missed in the configuring this?

Chicken code

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local sheet1 = sprite.newSpriteSheet( "sprites/chick.png", 82, 82 )
local spriteSet1 = sprite.newSpriteSet(sheet1, 1, 12)
sprite.add( spriteSet1, "sprites/chick", 1, 12, chickTTL, 1 )
views:1452 update:2011/10/2 9:44:12
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