Tonearm bias (anti-skate)?
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I had a 17D2 do that after using it for too long with the bias set incorrectly, I was trusting the bias scale on a Rega 300 arm. When I looked with a loup the cantilever was slightly twisted along its length and offset to one side a little, that was a lesson for me.
Off level would have a similar effect if not corrected soon enough. You might want to review how you set bias. Hint, start with a level table.