LEDs light up red briefly immediately after power is applied

Hello Respeaker Team!
I have 3 Respeaker Core V2.0 boards. On one board, some LEDs light up red for a short time immediately after power is applied, but not on the other boards. Can you please explain to me why this is happening, or how I can stop the red LEDs from lighting up?
Thank you in advance for your help!

Best wishes
Hannes