First of all, sorry if it's already asked somewhere

I've this problem: when encoding a movie with DVD2SVCD everything goes great, the *.mpv appears, but than pulldown comes into action, and after that I've got another *.mpv, but that one is really strange.
The encoding process goes on, and at the end I get the same (sort) movie as the *pulldown.mpv movie (duh), but the strange thing is that the first (first mpv, before pulldown) movie is good, but the second one (after pulldown) goes up and down It does that with a quite high frequence.
Is it because of my pulldown version (I'm using the newest DVD2SVCD)?
thanx in advance