Light leakage (and uneven leakage at that) is normal with this keyboard (this new keyboard has more travel than the butterfly design, which had less clearance and leakage.) And while it is hard to tell from what angle you are viewing from, yours does appear to have more than others. My first 16-inch had a good bit of this light leakage (as well as a very 'wobbly' space bar). It annoyed me a bit because it shined in my eyes when sitting the computer on the bed. I returned it to get the same model with an upgraded GPU and the upgraded 16-inch has much less leakage and 'wobble' - for that matter, display units I looked at also had less leakage than my first 16-inch as well. (I'd be lying if I didn't tell you that this has slightly contributed to me liking my second 16-inch more than my first...the vastly better GPU has most of the impact here, but not having to turn off the keyboard LEDs every time I sit the system on the bed is a nice plus.)
If this is a new computer and it bothers you (especially if it shines in your face with how you use the system), you are completely within your right to send it back, and Apple would rather you send it back than you keep it and be unhappy with it. That said, do understand that the replacement model might or might not have less.