Signatures dont match Custom Membership provider

I'm using a custom membership provider for my website.
However the signatures for the methods showing in the intellisense dont match the signatures for the methods in the custom membership provider.
For example the intellisense show 2 possible signatures for user.ResetPassword:
user.ResetPassword(passwordAnswer As String)
user.ResetPassword()
However, the custom membership provider only has one method signature:
user.ResetPassword(userName As String, answer As String)
So why is the a mismatch between the custom provider and what Im being offered in the code.
Any advice would bve greatly appreciated.
 
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