That's an itty-bitty wake. Kudos to you for attempting 3s on it. Do what Nick said: crouch down. You need to get low, drive the board forward a few feet, then stick out your hand, give a little pull, throw your head and assist with your feet.
You have a board under your feet that's all nice and calm and happy, just surfing along. Then you suddenly lurch downward to grab the wake and your board freaks out and puts on the brakes. Don't disturb your board. Crouch down slowly, then casually grab the wake and spin. Keep your board happy