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HELP! Text changed in one page gets changed in all parent pages

We created a duplicate page and when we update the text in the child page, it gets duplicated to the parent page. Every time we duplicate the selector and add a combo class to the new section (for example, “nazarite-contact-us” and “new-contact-us”), then we see the selectors changed in the parent class. The Selector indicates that there is only “1 on this page” YET when I make changes to the text, it renames the text on the OTHER page.

Is due to using a CMS?