Why does music keep fading in when I split the sound?

Okay, this is going to sound weird but for some reason in movie maker when I split a music track or any sound file for that matter, instead of sounding at a normal volume, the sound fades in, even when I don't have fade in volume selected. Is it supposed to do that? If so why and if not how can I fix it? I've already quintuple checked to make sure that fade in isn't selected and I noticed it mostly happens when I split one track and try to continue it. I thought saving the audio file would help but it didn't. Please help?