It's not part of the design but since it's plastic, it will have a gap as it's just a molded curve and connected with 1 screw toward the bottom there. Mine has a small gap on the left side but on the right side it is slightly larger. It has shifted over time. The only way to get rid of that is some adhesive and I don't think that's part of the normal install process. I tried pushing it inward and it's not something that would've been completely flush without adhesive.
Your install is still new so you can be picky (I wouldn't blame you) about it and bring it back.
As a reference, this is my left side from a year ago which I deem acceptable.
