HyperPixel 4.0 Square backlight seems dim on the edges

I received today the HiperPixel 4.0 Square and set it up with a Raspberry Pi 4. After installing the drivers and making it work I noticed that the backlight seems to be really dim towards the edges, something that I have not seen in other videos and pictures of the screen. Could this one be defective?

Somethings not right? Is the glass bezel lifting off (separating) at the bottom?