Resultado diferente en el violín SQL y en el servidor MySQL/PhpMyadmin

No tengo idea de por qué SQL Fiddle es diferente al resultado real, pero logré que me funcionara en PHP. Utilice la siguiente consulta:

SELECT
  c.procno,
  CONCAT(CASE WHEN cnt > 1 THEN CONCAT(RN,'-') ELSE '' END, t.Proc) Proc
FROM
  (
    SELECT
      @curRow:=CASE WHEN @prevRow = a.Proc THEN @curRow+1 ELSE 1 END AS rn,
      a.Proc,
      a.Procno,
      @prevRow:=Proc grp
    FROM (    
          SELECT
            `incurredcharges`.`procedure_no` procno,
            `c`.`procedure` proc
          FROM
            incurredcharges
            INNER JOIN (
              SELECT `procedure`, `procedure_no` FROM `charges`
              UNION ALL
              SELECT `confinement`, `procedure_no` FROM `confinement`
              UNION ALL
              SELECT `service`, `procedure_no` FROM `ultrasound`
            ) c ON `incurredcharges`.`procedure_no` = c.`procedure_no`
          WHERE `incurredcharges`.`patient_no` = '34'
          ORDER BY `c`.`procedure`
      ) a 
          JOIN (SELECT @curRow:=0, @prevRow:= '') r
  ) t JOIN
  (
          SELECT
            `incurredcharges`.`procedure_no` procno,
            `c`.`procedure` proc, Count(*) cnt
          FROM
            incurredcharges
            INNER JOIN (
              SELECT `procedure`, `procedure_no` FROM `charges`
              UNION ALL
              SELECT `confinement`, `procedure_no` FROM `confinement`
              UNION ALL
              SELECT `service`, `procedure_no` FROM `ultrasound`
            ) c ON `incurredcharges`.`procedure_no` = c.`procedure_no`
          WHERE `incurredcharges`.`patient_no` = '34'
          GROUP BY `incurredcharges`.`procedure_no`,
            `c`.`procedure`
  ) c ON t.proc = c.proc

Lo único que cambié fue la línea 27 de JOIN (SELECT @curRow:=0) r para JOIN (SELECT @curRow:=0, @prevRow:= '') r