First opened file keeps re-opening after restart of Atom


The problem I have is that if I start Atom and open multiple files. I then close Atom and start it up again. Atom will then re-open the first opened file in the previous session. If I try closing that file and close Atom and then re-open Atom, that file keeps re-opening. The only way to get Atom to not open that file is to remove the project in the treeview. Is this by design and if so why?

I have no plugins or customizations at all.