I live in knowhere nova Scotia and my neighbor down the road brought a white XL home 3 days after I got my xlt, my dealer said they sold 5 in the region including mine and my neighbors
So this is actually normal it appears.
The bed is not a single unit design. As such they have left open areas all around the insert to provide proper drainage out of the body and away.
You will notice drain holes at the front and all around the joint that go to the underbody drainage.