brisbane web development may get more searches but I also don't rank nearly as well for it as I do for terms with freelance in it.
Most of the enquiries I get follow on from searches that contain freelance and brisbane in the query, whereas brisbane web development is the only one of about 30 keyword phrases that I've been tracking that is showing the correct description.
As far as changing over time: it's only in the last month that these incorrect descriptions have shown up; everything's been fine up until now.