Why I don't stutter when I'm recording voice message?!

Why I don't stutter when I'm recording voice message?! Hey guys. I'm a stutterer. But you know what? I don't stutter even a bit when I'm recording voice message? I mean, no stutter. Zero I was talking to my sister yesterday, and my stuttering was terrible because of lack of sleep. But she went to another room, and I recorded a voice message for her and stuttering was all gone! I'm able to record tutorial videos without stuttering, or even talk to camera without stuttering, when I'm alone. Is this normal? Do you experience something like this or ...?