And here is another post about two title tabs due to a system key sequence found by google search.
Quote:
At a guess, you have enabled tabs in an app that doesn't support them - the result appears as a double title bar.
Sierra comes with a feature that allows compatible applications to create multiple tabs in one window, much like a web browser. On an incompatible application, accessing this - using Cmd ⌘ Shift ⇧ T will generate a second title bar below the regular one, with no apparent way to get rid of it.
Try hitting Cmd ⌘ Shift ⇧ T again, then relaunching the app.
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