Why a change may not go live
After Apply, Camello reads the page back as a visitor would. If the change is missing, a page cache or another plugin is usually why. Clear the cache and retry.
After Apply, Camello fetches the page as a visitor would and looks for the change. If it is there, the change is verified live and measurement starts.
If it is not there after several checks, you get one email. The usual causes are a page cache that has not refreshed, another plugin writing the same field, or the Camello plugin being disconnected.
Clear your site's cache and press Verify again. If it still does not show, undo the change. Nothing else on your site is affected.