Subtracting frequencies causes ringing

I have a saw wave and when I go into the wavetable editor and remove the harmonics around 7K I see a peak of about 2db right at the high end of the cutoff. See attached. For comparison, I don’t see serum having this behavior.

What happens if you adjust the phase of that peak? Wondering if it’s just due to where it starts in its rotation maybe?

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Thanks for suggestion. I tried, but it was too hard to see any relationship to make deterministic changes.

Maybe if you just pull down the amplitude to match, I would assume that would take away from the sound too much