You are doing it all wrong, Betacam is a great format, the last thing you do to it is convert it to crappy DVD mpeg-2 via composite.
The purple artifact could be a problem with the deck or the DVD recorder, you will have to test components one at a time, deck to TV and DVD to TV playing something, Use process of elimination.
Ideally find a deck with SDI out or at least component out and transfer SDI to computer with a SDI interface or capture component with a component capture device.
https://www.youtube.com/@Capturing-Memories/videos
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