Normal - the casing on the SP3 needs a bit more QA imo. Every Surface I've looked at and owned, also has an issue with the glass screen not being completely flush against the casing - like in some, it overlaps a bit, while on others, it's very recessed so that the glass edge feels sharp - and even on individual machines, this can vary on each of the 4 sides. Something you probably won't notice till you've owned one for a few months.