This is exactly what you should expect. It's what happens when two sound sources (ie 2 oscillators) are playing at a similar pitch, but slightly detuned. The frequencies of the two waveforms are not the same, therefore don't line up with each other, which is what causes the inter-modulation.
Adjusting Detune will change the speed of the modulation. If you want to get rid of it, you need to turn Osc2 Detune to 0. This will stop the detuning modulation, but you will still get phasing, because the two oscillators' waveforms (which are both Saw in the Start and -INIT- patches) don't start at exactly the same point in the cycle. To cancel this, you need to set PhaseInit (Osc Edit Menu) to something other than 0. This forces the oscillators to start at a particular point in the cycle at Key On.
Bear in mind that removing all of this inter-modulation (particularly the Detune) will remove any 'analogue' warmth from the sound. I guess this is what you're trying to achieve though?
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