When you connect to your Google Analytics account through the JSitemap Professional integration, if your Google account has more than one property website, by default Google will return stats for the last added property domain.
In this case you can specify a particular domain available in your Google Analytics account for which you want to retrieve stats, to do this simply use the configuration parameter 'Site domain' as shown in the picture below and set the needed domain address.
Moreover you can directly monitor all the real domains assigned to your Google Analytics account and pick up the correct one. To do this, you have to leave empty the 'Site domain' parameter and enable the parameter 'Advanced settings' -> 'Enable PHP debug' in JSitemap configuration. After that, when you open the Google Analytics integration you will see the list of real domains available for your Google Analytics account used to login.