Basic `select distinct` program - Coq and Rosette executions don't agree

[qaisjp]

/* define schema employee, 
   here employee can contain any number of attributes, 
   but it has to at least contain integer attributes 
   eid and age */
schema customer(id:int, name:text, city:text);
schema account(num:int, branch:text, custid:int, balance:int);        

-- define table uw_emp using schema s1
table accs(account);
-- define table uw_sal using schema s1
table custs(customer);

-- define query q1 over uw_emp and uw_payroll
query q1                
`select c.id, c.name
    from accs a, custs c
    where c.id=a.custid
    and a.balance = (select max(al.balance) from accs as al)
    group by c.id, c.name`;

-- define query q2 likewise
query q2                
`select distinct c.id, c.name
    from accs a, custs c
    where c.id=a.custid
    and a.balance = (select max(al.balance) from accs as al)
    `;

verify q1 q2;           -- does q1 equal to q2?

results in

Coq and Rosette executions doesn't agree. File an issue!