I am unable to update my user profile settings on Stack Overflow as I receive the following warning:
Oops! There was a problem updating your profile:
This email address is already registered. If it belongs to you, log in above or visit our account recovery page to get access to this account.
I have read through some of the similar questions about having to merge accounts but I only appear to have one account. I tried logging in with Facebook and standard email but both appear to link to the same user number.