SQL Audit Log In Repeats Results
It looks like you're using SQL Server Management Studio (SSMS) to query your server. SSMS will open one session for your query tab, plus another session to populate the Object Explorer. 

By default, SSMS also has IntelliSense enabled. IntelliSense will make a high volume of very quick database queries in order to validate your query against database schema metadata. Each of the queries will involve a login to the server. I suspect this is responsible for the majority of what you are seeing. One quick way to verify is to disable IntelliSense on your SSMS. Alternatively, you could run you test from another tool that is less "chatty" with the database (such as the SqlServer PowerShell module or sqlcmd CLI).