Check if the “Retina” option in the Theme editor module is enabled. You can disable it to see if images show out fine.
If you need the retina feature, then check if there are _2x image types on the BO>Images page like this http://transformer2.sunnytoo.com/doc/index.php#dimensions
If you can’t figure out the problem by yourself, send us your site url so we can take a look to give you more accuracy answers.
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