Windows 10 movie maker music

Created a video last night and added music. Each video clip that had sound I made sure to turn the video volume all the way down and I turned the music volume all the way up. I also emphasized the music. My issue is the music will play at a normal volume and than all of a sudden fade away and than come back. There are three songs in this movie maker video and at 1st it was only the middle song, now all three seem to be doing this.  Any suggests? 

Side note: I listened to all three songs off of movie maker and all three had constant volume through the song. 

Thanks