Philips 7304 and HDR

Hello,

i need some advice with HDR of Philips 7304 because if i use UHD Blu Ray (hdmi connection), color looks washed out.
Here's some pics to explain what i mean:

SDR - Color Setting: 53



HDR - Color Setting: 53



HDR - Color Settings: 75



There are some differences, but i have to set color setting to 75 instead of my default 53 to have this result. If i keep the same setting as SDR, so 53, colours look completely washed out.
There is something i'm doing wrong?

Thank you in advance!!