The thing about Lancer is, this has always generally been done on a HEX and not a SQUARE grid, where that would matter, but there are rules for both and they're equivalent. For this translation into a game, it seems Olive has used squares for the map instead but kept the math the same from Hexes to Squares. Page 64 down from the core rule book makes no differentiation between measuring range/adjacency or otherwise on a Hex or Square grid map.
I'm not sure if that was an oversight, intentional, or if they're going to change to Hexes like most of us are used to; but according to the rules we play by on paper? This is working as intended.