I just got the same monitor and it suffers from the same problems. I sent the first one back and got a new one. Same problems, a bit milder though. Complained and got a third that is also wrong, with an added BLB.
The same thing, it is worst in the upper left corner, but visible in other areas too. It reaches halfway down the sceen and about 1/3 towards the right. A smaller glow in every other corner. It doesn't show in light pictures, but in dark areas it does. In black screen, or in dark areas in games, like Shadow of the Tomb Raider it was like having extra light sources in the cave.
I have used plenty of IPS monitors and never seen anything like that. Not even my old Acer 270HU which should basically be same tech, except the resolution and HDR.
The strange thing is I went to another nearby store to see their monitor on display and the picture was perfect. Although the environment was much brighter. So it seems like a problem with the model, but then not. And they said they had sold plenty of them with no returns.
So I am confused. Am I overreacting or extremely unlucky to get 3 defected ones.
Anyway leaning towards returning it and getting a refund. The store offers 50 days refunds on everything. You can even use it for 50 days and return it as long as you don't damage it.
I contacted Acer suppot with pictures, that look much like yours and they said it seems like a defect, but how I got 2 new ones and both have the same problem, I can't understand.