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I have both images on this form and none of them has 640px width. Are you referring to the first or second image? If you want it to be properly viewed on Iphone 5 you can try adding mobile responsive widget to your form.
1. Search for Mobile Responsive under widget section:
Your form should look like this when viewed in an Iphone 5 device.
It looks like this before widget has been added. Image is wider and larger that the first 2 image.