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What is the aspect ratio of both the sequence and the still images.
I assumed 16 x 9....can it be anything other than 16 x 9?
Check and make sure both the sequence the image PAR's are matching. It's possible one is 1.0 and the other is 1.2121 or something to that effect. In some cases 16x9 is 1.2121 PAR and in others 1.0 PAR.
I just created a new Photoshop image at 1920X1080. It fits my 1920X1080 frame in Premiere Pro CS6 perfectly. Both are using square pixels.
I agree with ComputerNovice25. Check your PAR (Pixel Aspect Ratio)