"Hands" do not appear at the beginning of the video (Redenrification)

Hello, how are you?
I would like to ask a question about redemption.
When playing the video, in the app, the image of the hands, and the video itself, are present at the beginning of the execution, and the hands are frozen until the audio starts to play.
However, after redefining the video, and running it, the grades start to drop, without seeing the image of the hands. The video itself, and the image of the hands only appear when the audio starts playing, as well as the first note arriving in sync with the audio playing.
In short, at the beginning of the video, until the sound and the first note are played in sync, no image of the hands appears, only after that.
I looked at the tutorials, and I didn't find anything that helped me. Could this be a possible error or "delay" of rendering?
Hugely grateful in advance! Love this app!

PS - follow link for analysis:  https://drive.google.com/file/d/14qxKp9cfGGYB-FmLNluu_0IHQxhxhSIn/view?usp=sharing