Fade-in not working on duplicated tracks

i5 2500k
Windows 7 Ultimate 64

The fade-in isn’t working on duplicated tracks that I made during my last session. If I move the audio to another track and set a fade-in, it works. But on the 15 tracks I made by duplicating other tracks, setting a fade-in on those tracks produces no fade-in effect, like the fade-in is just being ignored.