Windows Lock Screen Flickering with Alienware AW3821DW

Hey everyone, So yesterday i received my Alienware AW3821DW monitor. It's bloody brilliant however i've run into a pretty strange issue with it. And I'm confident its a windows problem and not a monitor problem. FWIW this is my first time with a high refresh rate monitor so i'm not sure if this is normal or not.

Currently my setup involves 3 monitors. 2x Dell 27" U2717D's running at 1440p, 60hz and the Alienware 38" AW3821DW running at 3840x1600 and 144hz with HDR.

When i have all 3 monitors turned on and i have HDR enabled on the alienware, when i go to the lock screen, the alienware starts to flicker like crazy. Once i log back in again it's immediately fine again.

This is where i believe it's possibly a windows issue. If i disable HDR and leave all 3 monitors on, the problem stops. If i leave HDR on but turn off one of the Dell's, the problem stops. If i leave HDR on and both of the dell's on as well, but turn the alienware down to 60hz. The problem stops.

Is there a way to resolve this? Or is this simply an issue that windows has yet to address and fix? I've heard of similar issues where this issue can occur unless you go and buy all 3 monitors at the same refresh rate.