Malformed url in Registration Email

The email received when a user registers contains an invalid URL format.

The email contents are below:
________________
Username: testuser

To set your password, visit the following address:

?action=rp&key=FVPWldB2TSBo3ao9Sy9H&login=testuser

https://www.test.com/login/
________________

For some reason the action appears before the login link.

Not sure where to look for this.



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