Evolution Power Sports blow off valve problem?

I installed the "vent to atmosphere " BOV on my turbo and its seems like it’s sticking. When I first crank it up and it vents you hear the full phiiiiiiiiiiish. After riding it for a second when it vents it’s a very short burst of air. Like very short. Nothing like it does when you first ride it or in the sample video.

Anyone else have that problem. ?