The perspective of left and right should be with you facing the speakers.
If you're using the analog outputs on your DVD player then maybe you reversed the left and right channel interconnects going to the receiver... Or it could be as Kr4 suggests, an inconsistent audio mix.
If you're using the analog outputs on your DVD player then maybe you reversed the left and right channel interconnects going to the receiver... Or it could be as Kr4 suggests, an inconsistent audio mix.