Hi @AhtfulDodja ,
No , that is not some kind of Lens Distortion effect. That is how you modeled it. It’s a relatively Low-Poly model and you can see this all over the place:

Due to Smooth Shading, you don’t notice this too much, apart from certain viewing angles.
The Beveling on the top corners is also not ‘perfect’ in your case, but I wouldn’t worry about that too much, you did well and made a great model, that you can be very proud of!