You're not correctly reading the map. If Lyn was 4 from Eliwood, then there would be a battle on the red space below her. Conversely, I'd be willing to bet Lyn has a path directly to the green space above her, and her distance to Eliwood and Hector is almost equal.
Your eyes are deceiving you. Physically your bases are very close, but in turns, Lyn and Eliwood are only 7 spaces from Hector's base, and 6 from each other's, so the effect is probably not as severe as you think. Hector's team is just doing well.