Flurry EF goes negative?

I was playing with Flurry and the envelope follower. When the Slew Direction is set to top (slew up) and you feed a trigger/gate into the Slew input, after Flurry has slewed the input up and once the gate goes low the CV from the Slew output immediately drops to ~-1v and then slowly creeps back up to zero.

Is this expected?

What are you using as a trigger/gate? Is it bipolar or unipolar?

It was unipolar from a Pamela Pro Workout.