Comics have a lot of inconsistencies in them. We have two data points out of thousands.
Storm's instance happened years before the Jean instance. Maybe Sue let her use her powers across her field in the one because they were working together, and maybe she was treating Jean as a hostile in the later instance and locked it down completely. Maybe the creators of the annual with Storm didn't think things through. I just don't think you can try to explain the nature of their powers by looking at these two data points, without knowing the exact nature of Sue's powers and her ability to modify them.