Why do I keep getting distortion on my final mixdown - Cubase 5

I finished working on this song and did a quick bounce to Mp3, when I take a listen on my phone speakers I hear distortion similar to the sound of my laptop CPU. I’ve set the buffer to different rates but it still comes out with the distortion.

Someone please enlighten me how to get rid of this cpu flare on my mixdown… I’m using a behringer umc204hd.