Cross database query not returning wanted result

Question

I'm trying to get data from another database "Finantial" but the result its returning is not the same as the result I get in the other database with the same code minus the dblinks

Here is the code I'm having issues with:

select trans.accountid ,sum(trans.amount)as montantpaye,loan.amount-sum(trans.amount) as montantrestant,loan.duration-count(trans.transid) as moisrestant
from (SELECT * FROM dblink('user=postgres password=password dbname=finantial', 'select amount,accountid,duration from loan')
    AS loan(amount int,accountid int,duration int)) as loan,
    (SELECT * FROM dblink('user=postgres password=password dbname=finantial', 'select accountid from account')
    AS account(accountid int)) as account,
    (SELECT * FROM dblink('user=postgres password=password dbname=finantial', 'select amount,accountid,ksymbol,transid from trans')
    AS trans(accountid int,amount int,ksymbol varchar,transid int)) as trans
 where trans.ksymbol='UVER' and
        account.accountid=loan.accountid and
        trans.accountid=account.accountid
group by (trans.accountid,loan.amount,loan.duration)

and here's what i get

whereas when I query this data in the database "finantial" with this code :

select trans.accountid, sum(trans.amount)as montant_paye,loan.amount-sum(trans.amount) as montant_restant,loan.duration-count(trans.transid) as moisrestant
from loan, account,trans
 where account.accountid=loan.accountid and ksymbol='UVER' and trans.accountid=account.accountid
group by (trans.accountid,loan.amount,loan.duration)

I get this result :

I would appreciate it if you could tell me what I need to fix in my code.