mysql query returns more than 1 row on server

I have a problem with the query, locally it works fine but on the server it shows me "Subquery returns more than 1 row" If I put :

select value 
from cngv field 
where cngv.month>='9' 
and cngv.month<='9' 
and cngv.anno='2022' 
and cngv.idField='8'
and cngv.cvl=username

It works perfect but I'm interested if you ask me from 1 to 9

SELECT `anno`,
       ( select valor 
         from campo cngv 
         where cngv.mes>='1' 
         and cngv.mes<='9' 
         and cngv.anno='2022' 
         and cngv.idCampo='8'
         and cngv.cvl=username
        ) as numfilles , 
        `a`.`nombre` as `tipo`, 
        concat(format(SUM(totalp+totalsp), 0, 'de_DE'), '€') as Totalpartners, 
        concat(format(SUM(totalap+totalacp+totalsp+totalscp), 0, 'de_DE'), '€') as Total, 
        concat(format(SUM(Totalac+Totalsc), 0, 'de_DE'), '€') as TotalComputado, 
        concat(format(SUM(Totalac), 0, 'de_DE'), '€') as totala, 
        concat(format(SUM(Totalac), 0, 'de_DE'), '€') as totalac, 
        concat(format(SUM(Totalscp), 0, 'de_DE'), '€') as totalsmartpartners,
        concat(format(SUM(TotalSmartCaptado+TotalSmartCaptadoPartners), 0, 'de_DE'), '€') as totals, 
        concat(format(SUM(Totalsc), 0, 'de_DE'), '€') as totalsc, 
        concat(format(SUM(Totalsc+Totalscp+Totalac), 0, 'de_DE'), '€') as totalcaptado, 
        `img`.`CVL`, 
        `img`.`CVLDescendiente`,
        CONCAT(`first_name`, ' ', `Last_name`) as first_name
FROM `informe_mensual_gestor` `img` 
JOIN `users` u ON username = img.v 
INNER JOIN areas a ON a.id = u.Area 
WHERE `img`.`v` in (6609114, 93764) 
AND `img`.`Anno` = '2022' 
AND `img`.`Mes` >= '9' 
AND `img`.`Mes` <= '9' 
GROUP BY `Last_name`