I've inserted an image (png) into my application but they all get disorted. Like this image of the appstore icon: http://www.urme.com/corona-image-dump.png

All images I insert looks like this, they get an extra pixel at the top and left.

The only workaround I've found is to add 2 transparent pixels around all my images.

Why does this happen?

My code for inserting the image:

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local storeLink_ico = display.newImageRect("assets/icon-appstore.png", 33, 33);