Your bike is perfectly normal, which is why FDs now mostly are made with the ability to trim. The shift cage is of a certain width, and as the angle of the cage coming to either chainring changes it'll move over within the cage, eventually till it rubs. It's an effect similar to that parallax.
To understand it better stand outside the door to any room in your home, and line up something in the room. In this thought experiment, the object is the chainring, the door the FD cage, and your line of sight is the chain. Now move over to represent moving the chain to adifferent rear sprocket, and you'll notice that your line of sight is closer to either door frame, and as you move farther it's blocked entirely (rubbing). The only way you could see that reference object from where you are now would be to move (trim) the door frame over slightly to the same side.
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FB
Chain-L site
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