Without seeing your coding, no one here can give you a definitive answer. Try selecting the area that is supposed to have the different information and pressing the F9 or Fn+F9 key.
These fields do not automatically reset.
You could give us a link to the "solution" you were using. Forums are just that, specific answers to specific questions. Your situation may be different.
See also:
If what you are doing is hiding part rather than inserting/deleting keep in mind that the other information will still be in the document.