Question About Primer

Hey,

This isn't a specific patch request but more about some interesting behavior I noticed while messing with Primer.

While programming the patch attached below, I tried changing the LFO setting between Mono and Poly. However, the Mono setting seems to create a completely different sound than the Poly setting. I've attached two audio files as examples.

I wondered if this was due to some slight de-synchronization of the notes being played, but this doesn't seem to be the case. What is going on here?