MeGUI failing to detect Interlacing

[Siberian]

After reencoding several dvds using meGUI i noticed that 1 ep in particular had some very noticable interlacing artifcats in the final encode. DGIndex detects the source as interlaced TFF. But the MeGUI analysis detects it as progressive.

I made a d2v of a small 1 min section of the source and put that in MeGUI and it detected it as partially interlaced with varying field order. So obviously the analysis detects the interlacing when on a small specific section fo the source but not when doing the whole thing. I tried changing analysis percent to 100 but with no luck.

So are there any options i can change to help MeGUI detect it as interlaced? Or at the very least is there some way that i can make a new avisynth profile and force deinterlacing?