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My thought would also be polar alignment. A drift align or even just a drift check would confirm if it is. Align the scope to the point that you think it is aligned. Slew to a star, get it dead center (use crosshairs if your imaging program supports it). Turn on sidereal slewing and take a photo.
Wait 5-10mins then take another photo. Star still centered? Then your polar aligned - really well actually.
Star off center? your not polar aligned. Star not visible? Your really not polar aligned.
My other thought is - are you using a side-by-side adapter? They will never center first try no matter how good your polar alignment is but should be good once you manually center it and sync.
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