When I play a certain mpeg file with my DVP5100 it seems to be stretched vertically. Can anyone tell me why this happens and how I can fix the problem?

Info from Gspot:
MPEG-1 System Stream << { 1 vid, 1 aud, 1 other }
Sys Bitrate: 2160 kb/s
MPEG1_Payload 320 x 240
FAR - 1.333 (4:3)
PAR - 1.185
DAR - 1.580 (30:19)
MPEG-1 Layer 2
0xc0:32000Hz 128 kb/s total (2 chnls) CBR