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Version : 2.0a

    By default the plugin is not converting the user names entered into lower case. But by default this should happen as per line 406

Line 406 : case 'LowerCaseUsernameScheme':
              global $wgLDAPLowerCaseUsernameScheme;
             // Default set to true for backwards compatibility with
             // versions < 2.0a
             return self::setOrDefault( $wgLDAPLowerCaseUsernameScheme, $domain, true );

Reason of this not happening is where ever this configuration is used it is used as 'LowercaseUsernameScheme' not as 'LowerCaseUsernameScheme'

Line 950 : 	if ( $this->getConf( 'LowercaseUsernameScheme' ) ) {
		$username = strtolower( $username );
		}

Line 1160 : if ( $this->getConf( 'LowercaseUsernameScheme' ) ) {
				$canonicalname = strtolower( $canonicalname );
			}
    Due to this case mismatch in the code duplicate users are getting created when the AD users enter their user names in different cases.