Because apparently, the world is run by pedants who insist on the importance of the correct word order.
In a world where the difference between 'I am walking down the street' and 'I am walking down the street' is a matter of debate, we're here to tell you that, no, 'I am walking down the street' is indeed walking down the street. And don't even get us started on the horrors of 'The cat is on the bed.'
Grammar Rules for the Dedicated Word Order Quiz Etimology of Bad Grammar