x15 R1, lid not closing fully

May I ask if this is normal? I only had my laptop for 2 months and I am not constantly using it everyday maybe 5x a week but I always use to open it in the middle of the lid around the front camera part to balance the force.

I just noticed it yesterday that the part in where I open it (the seam) is not flat, it curves and doesn't flat on the keyboard but both of the sides are flat, just the middle part where I open the lid.

See pictures the lid on the middle part (front cam part) is not fully close it curves and doesn't flat out on the keyboard when closing, is this normal?