Sounds like it could be normal. Is this a new sound? Go to the dealer and have them start up the exact same year/make/model and see if they all do that. Other than that I’d have to guess the sound is coming from the starter motor.
I’m not sure that I hear anything very unusual. However, if you keep using the starter motor like this, you will probably have an early failure of that component.
If I would hazard a guess it might be the starter motor is disengaging a tad late or slow, and the flywheel tooth hitting the starter motor tooth.