I’m frustrated

My music starts off real slow and then picks up

Good morning,Just wanted to know if any one could help me.When i hit the play button on the controller, the song starts real slow then picks up speed unlike before when i hit the play button and it goes directly to speed. It's frustrating trying to mix and having to wait for the song to catch up to speed. I have read the manual over and cannot find the reasoning for this.Can anyone offer me some assistance.
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