Duplicate value parameter

Duplicate value parameter

Hi. I'am using JQuery Mobile and have one problem now. I'am use this code:
  1. <div class="button"
  2. <input type="submit" value="sign in" />
  3. </div>
But browser generate this code:
  1. <div class="button">
  2. sign in
  3. <input type="submit" value="sign in" />
  4. </div>
Where does the extra inline text sign in?