Changed "Sub-topic" not compile

In my writing I have changed the names of sub-topic and headings quite a few times.
First I wrote my heading as " Model 2". I have changed my heading to " Period 2: 2000-2009". But, the compile output shows old heading as Model 2 not as Period 2: 2000-2009. This doesn’t update while compiling. It is seen updated on Scrivener but issue is on compiling. There are more such case in file. Did I mess up in my setting?
How do I update and display it in compile output?
Details of computer:
Windows 10
MS word 2016
Scrivener Version: - 03 Oct 2018
Thanks, Dina.