Scripts are added twice (hardcoded & enqued) when creating a template

in order to create a wordpress template besided my index.html I uncheck “This is the Master Page” at the “Wordpress Site” action. Now when I inspect the generated code in the browser all the scripts are added twice. One time hard coded and one time dynamically enqueded. Now do I suppress the scripts to be hardcoded?

My master page “index.html” only adds the enqued styles.

And what exactely does “Don’t export this page” and “Don’t export template parts” do?

Thank you very much!