Adding Google Analytics code both manually and automatically may cause it to work improperly. Please add GA code either automatically or manually, not both ways.
1. Choose the landing page that you want to connect to your GA.
2. Click on the settings tab.
3. Choose "Google Analytics" and click "Log into Google Analytics".
4. After login, please provide all the necessary permissions. Then you will be able to choose your GA profile, that you want to integrate with the Landing Page. Please select UA code to integrate.
5. Finally, click "Save" and from now you should be able to track your landing page user with Google Analytics.
Good luck :)!