PS3 Slim Squished Widescreen Picture on DVD

[adamclark83]

The other night I was watching a region free DVD on my PS3 slim and even though it's formatted in 16:9, the player "squished" the picture to 4:3. That was disc 1.

Play disc 2, the episodes are displayed as normal, in widescreen.

The player is set up to play discs as presented; 4:3 picture displays as 4:3 and widescreen as widescreen.

When I tried Disc 1 on a standard DVD player, the picture was displayed as proper widescreen.

What could have caused this???