Could you fix the pathfinding, please?

Few minutes ago I died because my champion (Hecarim) decided to move towards the enemy, even though I was clicking for him to move back. (This was on Howling Abyss. No, there was no Ahri in their team). Often it happens that I click on one side of a mountain, and the champion starts moving around it, as if I clicked on the other side. It's extremely frustrating.