i bought 3 flites this week and one off them is very noisy the set up from all 3 is the same 4mm stroke medium bar 12v like i tattoo with them

so here are the video's off them from quiet to loud
is this normal if not can it be solved?

<span class="_5yl5" data-reactid=".1d.$mid=11435227758970=2987f544a275766ea 94.2:0.0. 0.0.0"><span data-reactid=".1d.$mid=11435227758970=2987f544a275766ea 94.2:0.0. 0.0.0.0">https://www.facebook.com/onechanceta...ideo_processed

<span class="_5yl5" data-reactid=".1d.$mid=11435227758970=2987f544a275766ea 94.2:0.0. 0.0.0"><span data-reactid=".1d.$mid=11435227758970=2987f544a275766ea 94.2:0.0. 0.0.0.0">https://www.facebook.com/onechanceta...ideo_processed

<span class="_5yl5" data-reactid=".1d.$mid=11435227758970=2987f544a275766ea 94.2:0.0. 0.0.0"><span data-reactid=".1d.$mid=11435227758970=2987f544a275766ea 94.2:0.0. 0.0.0.0">https://www.facebook.com/onechanceta...ideo_processed