Jelly Bean doesn't seem to like the maxlength attribute of HTML for text input. It certainly restricts the number of input characters but the moment you attempt to type beyond the allowed number of character, the text box fails. Now you won't be able to type in any other text boxes and nor will you be able to delete the already input character, in that text box.
If you haven't already faced this, then try it yourself on a simple HTML and check. Please tell me if you have any clue for solving this.