a trivial display question

I have an unimportant but to me mystifying question. Why, while r.mapcalc is
EXECUTING a map, do the 0% 2% 4% etc. numbers usually come out in the same
place, one replacing the next, but suddenly (for no reason that I can see) come
out NEXT TO each other, so that the whole screen fills up with numbers and
% signs? Have other people seen this?

J.Rossing, jr20@cornell.edu