VG240Y sbmiipx not working properly

Hello! I've recently purchased a VG240Y sbmiipx monitor and since I started using it I've notived that some of the modes have really wierd colors (I'll post some photos just to illustrate what I mean, they aren't accurate since they were taken with my phone but you can easily see what I'm saying), it seems like there is a "grey screen" in front of every single color mode beside HDR mode.

Also, sometimes the screen seems to "refresh" and you can tell that there's a difference between the colors before and after this refresh (the screen doesn't turns off real quick or anything like that, it just blinks/refreshes).

I've tried to update the firmware but it didn't work. Also searched for any kind of similar problems and found out that changing the color settings to NVIDIA instead of default could solve the problem and it did make the image quality improve (in HDR mode, other modes still the same but it is kinda pointless since HDR was the only one working in a acceptable way) but the blinks still happen and other color modes still with that wierd look.

Also contrast seems to be a problem, before and after the firmware update.

If this is a known glitch/problem any kind of solution would be really appreciated.

Thanks in advance!