Post Processing Color Grading, problem on Android Mali GPU

So lately I got a Redmi Note 9 (2020) which has Mediatek Helio G85 and I notice a problem with color grading in my game, Even tho most effects work normally. Using color grading makes colors look like they are limited to 16bit color space. Color transitions looking not smooth at all.

Please take a look at the skybox and the white sign at the front at the picture below. I also test the game on OnePlus One (2014) Snapdragon 801 Krait 400 GPU and there’s no issue there.

I was using Graphics Api OpenGLES2 I removed it and change it to OpenGLES3 and the issue was resolved but I have a new issue now.