Bizarre standard DVD playback

[jeffthe13th]

I noticed that some of my standard DVD's play strangely on my Samsung bdp1400 Blu Ray player. Movies such as "Breakdown" with Kurt Russel that was put out by Paramount on DVD a few years back. It is a non anamorphic dvd, regular 2:35:1 widescreen. When I try to play it on my blue ray player, the picture appears in the center of the screen with thick black bars all around it (LEFT AND RIGHT SIDES as well as top and bottom). Shouldn't the bars on the left and right sides be non existant??? My TV is set to the proper aspect ratio and everything BUT for some reason this disc and other non-anamorphic widescreen transfers aren't displaying right.
Anybody else encountering this? Does it seem like a defective player (all BLU RAY discs play fine and most regulars DVD's play properly) OR something else?