Same reason that The Weather Channel uses little tornado graphics along the boundry line on the hot and cold where the latest ice storm is.
A lot of the errors in ANY show are done in post production where the subjects of any show have no say in how the actual show looks.
Unless your doing something like what I did with Current TV last year for the Five Part series called "Weather Paparazzi" where I was the writer, producer and main editor, you really have zero control on how any TV show will look even if your name is on it. If your the Executive Producer, then you will but I really doubt they had any say in it since it was produced by the same guys that did the deadliest catch and ice road truckers. So if you think about it, how much say do you think those truckers would have in the final editing and post production graphics.
Just my thoughts. But like I said before, I have no interest in if this thing takes off or falls flat on it's face other then how they show storm chasers in the field and how they act. If they make all the chasers look like idiots in next weeks show, then I may have something to complain about but so far, it looks like real chasing to me but minus the hour and hours of waiting around and picking your butt waiting for the cap to break.