Course not ending after timeline ends

Hello!

I am hoping that someone can help me out with an issue I'm having when publishing my Storyline360 project to video (mp4). My project consists of just one slide with multiple layers, which I then publish as a video so it plays automatically like an instructional video. I've tried multiple ways to make the video end/stop automatically after the timeline ends on the last layer, but it just keeps going! The video itself is only 5 minutes but then there is a blank screen until 9 minutes. I thought it was my background audio file preventing it to end, but I have stopped it after the last layer ends so that's not the issue. Help!! Thanks so much in advance. 

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