Yeelight lightstrip can't do light blue?

I have a very weird problem, my Yeelight lightstrip can’t replicate light blue color, but outputs purple instead. At first I thought it is because my wall isn’t completely white and it just changes the shade, but after closer inspection I found that when i set the lightstrip to light blue the red diode actually brightly lights up along with the blue one, but green one stays very weak.
Thanks to anyone who assists me.

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Exactly the same issue here. I regret the damn firmware update…