Does anyone else not have trouble public speaking?

Does anyone else not have trouble public speaking? I have had a pretty bad stutter since I could first talk, people typically notice within 2 minutes of casually talking to me (many times when I introduce myself). But for some reason whenever I have to give a presentation or speak in front of large groups my stutter completely disappears. I first thought maybe I was just so focused that I didn’t even notice the stutter but I watched video of myself and was shocked that I didn’t stutter once. It’s bizarre to me because I feel like it should be the complete opposite. Has anyone else experienced this?