anyone help - Im using procoder and am converting avi files (mostly divx) to vcd

23.9 fps files and 29fps files are fine with no probs but when doing a 25fps source the audio goes out of sync by maybe 1/4 second

im converting to PAL from all the sources and as pal is 25fps i cant understand the problem - the original avi files are in sync and im using the standard VCD PAL template that comes with procoder

any ideas folks?