DV is the only PAL codec with lower field dominance. Your field dominance settings in Compressor to make the m2v should correct this to upper and it should also be set as upper in DVD Studio pro.
The filters may also be set incorrectly. I am not aware of the settings in CGM aged film, but make sure the field dominance settings in the filter are also lower to match the sequence and codec(if they have settings for field dominance).
I don’t necessarily suspect the problem is in DVD Studio Pro unless you are monitoring every stage through a card to an interlaced monitor. Interlace errors are hard to pick up on computer screens. So check field dominance settings at all stages of the filters, Compressor and DVD Studio Pro as there is a mistake somewhere in one of those possibilities.