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I noticed that sometimes when I'm on my team's platform and I click to head to the bottom closest turret it will sometimes try to path me down the top ramp rather than the closest. This happened a few times playing Singed. To me it looks as though it makes its pathing preference based on where you are on the platform rather than where you're going (top half of platform wants to send you up. Bottom half wants to send you down)
It was very noticeable when I ran up the top ramp real quick to buy something and then wanted to run down the bottom ramp to stop a capture of the bottom turret.