Yes it seems you also created a duplicate account with us.
Not to worry, I've now deleted this duplicate account for you. Please try to request a password change again but be sure to enter your original username (not your email address).
If you'd like to connect your original account to Facebook go through your Preferences, which can be accessed through Edit » Preferences in Windows or Spotify » Preferences in Mac. Just scroll to the bottom and press 'Connect to Facebook' to get started.