Everybody... you can see the faint, invisible outline of a hexagon inside the grid of the top image... see the 8 points & how the diagonals reach nearer to the certain (are longer)?
It's just that the character faces where two sides meet & not to the center of a single side, you get it?
8-point can match up with hexagonal, it's just that you're not attacking through the diagonal side 'center points' (whereas you're able to on your flanks).
May seem odd now but I guarantee Unsung knows what they're doing with it & it's highly sophisticated.
Besides, you have to understand that there's often a suspension of disbelief with many TRPG's regarding targeting paradigms (for instance, a melee attacker isn't capable of attacking to a diagonal in FFT even though it's equidistant in real-world geometry).
P.S. yes, I'm also Hunter Bateman from the KS Comments. Nice to meet you all!