Attack move cursor problem/bug?

On the ingame settings theres an option to enable/disable "attack move cursor".

Enabled: your attack move will prioritize the enemy closes to your MOUSE

disabled: your attack move will prioritize the enemy closest to your CHAMPION

Now heres the problem, i have it ENABLED. My attack move click is binded to "a" key.

If i'm playing caitlyn for example and theres 3 meele minons in front of me and 3 casters behind the meele minions and i hover my mouse behind the caster minions and press a it will focus the minions closest to me instead of the one closest to my mouse.

Sorry it might be a bit confusing but its really annoying because i cant focus the backline minions with "a" even if my mouse is closest to them