Page created from class sheet is unable to show the added xwiki content

I followed the FAQ Tutorial to create FAQ cless, FAQ sheet and FAQ template.

From FAQ class,
I create a new page for Title “Q001” pages.
The "Q001" page followed FAQ sheet content to display the class property/value: Question and Answer.

However,
when I edit the “Q001” wiki page directly with adding some more wiki content,
the wiki content I added won’t show up.

I was expecting it will show FAQ sheet on the top portion,
and appending the added wiki content at the bottom.