https://issues.apache.org/jira/browse/AIRFLOW-3816
To quote: There's a "Refresh" button on the Graph view that instantly refreshes the DAG state. There's also a "Refresh" button that forces the webserver to reload the DAG definition from the filesystem. These two buttons use the same icon and are placed near each other, despite being used for completely different purposes and having very different implications. This has affected at least four developers on my team, and we are not a large team. I suggest renaming the "Refresh" that refreshes the DAG to "Reparse DAG", and giving it an exclamation mark icon to make it clear that it's not something one would normally want to press.
