I would suggest reaching out to them. Through their issue or otherwise, they clearly have your account tied to a social media login, which you didn't want. I can logout and log back in with no problem.I just logged out and back in and the same message is there. They have my email address. Maybe it’s just a glitch in the matrix, but their message is quite clear.
In the upper left corner beneath my name is an alert.
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I also created a brand new login with a different email address a few moments ago for testing purposes, and was sent an email to validate the email, and never asked to link or authorize a facebook account. Either they had a glitch when you first created your account, or you accidentally clicked the Facebook button (or followed a link/google that went to the Facebook login). I'm sure if you contact them, they can switch you back to a normal email/password login.