AW3225QF, problem with Dolby Vision

hey there. so I bought a couple of days ago at Best Buy  the Alienware - AW3225QF 4k qd oled 240hz monitor. but I just noticed that the black colors while on Dolby Vision are not perfect. meaning that in scenes where I have black bars like cinematic bars, both on top and on the bottom. those pixels are not off completely. that's not the case when I have it on SDR or HDR mode. it only happens with Dolby Vision. does anybody have this issue  too with that specific monitor?  thanks.