Oh, interesting.
Switch off Warble. It introduces a small latency to get the slowing down effect.
If you want to use it nonetheless, make sure the Mix in Warble Settings is full wet!
Note: the Mix Potentiometer on the front is for the Heat part and doesn’t introduce this phasing effect.
You don’t need AH mix setting to be full wet - parallel processing is one of the AH’s key features if desired. I’ve got the Mk2 and I love it, it’s the only Elektron piece I have right now.
I’ve got the MK1, it’s a +FX feature iirc? This is so weird 
oh well, I’ll report back if I figure it out later this week for anyone running into this issue in the future. Cheers for the suggestions!
My bad, I thought I had read that you had the AH+FX
Sorry, forget what I’ve said.