Sound volume doesn't change no matter what distance?

I have an empty gameobject with an audio source attached, I have the volume at 1, and logarithmic falloff, however, no matter how far away my listener is, it is always full volume? I've set the falloff to always be at zero, and it's still on full volume? the actual volume slider changes how loud it is, but the only way to make it not make noise besides turning volume to zero, is to mute it? Has anyone ever run into this problem before? I've got an old scene with an audiosource in it, and it's falloff works fine? if I copy it over to the new project, it works, but as soon as I do something like change the volume level, it goes back to always being full? Any ideas? PS. The sound is 3D