Pathing and Targeting objects/champions over walls.

So i've noticed this before and it drives me up the wall. I'm trying to target something over a wall, i have vision of it and can 100% reach it with my auto attack (if i'm standing in a certain spot). I click to hit the thing, and my champion starts to path AROUND the entire wall. Not moves up to the space that it's clearly reachable from, the champion decides to walk thousands of range around.

Like i'm in tri bush bottom, and want to kill a ward in the very back of dragon pit. I click the ward and my champion decides to walk around the corner and into the pit, instead of moving up towards middle where they can clearly hit the ward from over the wall.