While I don't completely understand why the white part of the eyeball becomes tinted red here, such problems are commonly due to a Premultiply Alpha (PMA) atlas being re-exported in Photohop, which does not respect PMA when re-exporting.
Unfortunately Photoshop is very bad in displaying the alpha channel info in png images, it might help to have a look at your images before and after your changes in e.g. GIMP or some other images editor that allows to display the full RGB information in (almost) transparent pixels.
Did you export your atlas with Premultiply alpha workflow (the default)? Or did you change it to Straight alpha upon export with Bleed enabled?
