I've never actually described dyslexia as letters jumping around but I guess it does make sense. Once on a cover letter which I had read over probably a solid 50 times and handed out in some variation to a lot of places I wrote something about maintaining a high level of accuracy while working at a fast pace. Except I wrote face past so I guess the letters do jump around and I just don't notice until it's too late. I always wonder if I actually have a different problem though because I tend to write a 5 when I mean to write an uppercase F and I have yet to find somebody who does the same.