Yeah I was bit off on that. It about 3mm or 2mm.

What really bother me is on the side that is deeper, I can see a steel frame on the inside which the lcd should be aligned with. On all the other sides that LCD is basically on exact same level as that steel frame. Seems like that side some how got unstuck from the steel frame.

Anyhow, I went ahead emailed Dell to see if they will authorize me to get an replacement for it or not.