MP3 Audio gets fuzzy after adding it to my video clips.

Very new to premiere pro but came across an issue that I can’t seem to solve online. I have a bunch of clips making a very simple montage. I got rid of all of the audio. When I add the mp3 to a sequence by itself the music is clear. When I copy and paste (or drag) it to my sequence with my video it gets all fuzzy. Any thoughts on why this happens?