Correct Installation of Google Analytics on Ruby on Rails

I have a friend who has a developer working on this site: https://www.cannasaver.com/

When I access different pages on the site the UA code seems to duplicate over and over again according to the Google Tag Manager extension.

The developer is saying this is normal implementation and there there is nothing wrong. However on the other sites they own such as this: http://cannapages.com/ -- this does not seem to be the case.

I am wondering if the Google Analytics code is correctly implemented on https://www.cannasaver.com/ -- Any help you have as to if it is correctly added or what to do to fix it would be great appreciated!