If you have chosen to export a Card to the Camera Roll with the background set to "off," the resulting image will have a transparent background. Due to a bug in the Camera Roll itself, this image may look wrong, or may be layered on top of another image in your Camera Roll. Although it looks wrong, the file itself is in fact, normal, and if you view it anywhere other than the Camera Roll (by emailing it to yourself, for example), you will see that it is uncorrupted.
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