HP Monitor Brightness bug/glitch? Brightness Changes Randomly.

[Biggie-S]

My monitor:

HP X27qc

I've been having a very bizarre issue with my brightness and contrast settings. During the day, the lighting in my room will change, and so i adjust monitor brightness accordingly.

When I first built my pc and plugged in my monitor (About a month ago) the standard contrast and brightness were both set to 100. I lowered those settings as needed.

At one point I had the settings as such:

Brightness: 60

Contrast: 100

For some reason these values have permanently 'saved?' themselves on the monitor. If I adjust brightness and/or contrast, the values will change BUT after a few seconds or after opening up a new window/program, the settings go back to the values above. What's more bizarre is this only happens once or twice when I power on the PC. Once I adjust the values a second time, they stay where I want them permanently. This happens every time I power on the PC.

Resetting the monitor to factory settings doesn't help. Brightness and contrast stay at the values I mentioned above. Switching off adaptive sync makes no difference. There is no option anywhere for auto brightness that I've seen, so I'm pretty sure this monitor doesn't have any such features. (I checked in control panel advanced power settings)

And so I'm left wondering, what the hell is going in here? What is even causing this to happen? If anyone has any suggestions I would be grateful.

Spec List:

intel i7 12700k

Corsair Vengeance 64GB DDR5 5200 MHz

be Quiet! Dark Rock Pro 4

MSI Pro Z790-P WIFI

Crucial MX500 500GB 2.5" SSD (X2)

Sabrent Rocket 4 Plus M.2 PCIE Gen 4 NVMe 2TB SSD

MSI GeForce RTX 3070 Ti 8GB GAMING X TRIO

Corsair Rm1000x PSU