Only one Facebook profile can be logged in and connected to your Sonlet account at a time.  Pick a single account to connect to your Facebook profile.  If you'd like to change which account is connected to Facebook, go to your account Settings. 

Scroll to the bottom of your General Settings and click Social Account Connections. 

Disconnect your Facebook profile from the account it is currently connected to by clicking Remove.

 It will then be available to be connected to the desired account.