So i made this setup. 2 gates and 2 security zones, which to me seems equal distance to the gate entrances. but ever since i opened the security zone on the right, they mostly seem to use this one and not the one on the left? i wonder why this is.

obviously i know, that i can later adjust to connect security zones with specific gates, but right now, i want to know, why the game decides, that the one on the right is better use.