Issue adding foreign key

I have 2 existing tables in my db:

iss=> \d pollgrpinfo
             Table "public.pollgrpinfo"
    Column     |          Type          | Modifiers
---------------+------------------------+-----------
 pollgrpinfoid | integer                | not null
 pollgrpid     | integer                | not null
 name          | character varying(100) |
 descript      | character varying(200) |
Indexes:
    "pollgrpinfo_pkey" primary key, btree (pollgrpinfoid)
    "pollgrpinfo_pollgrpid_key" unique, btree (pollgrpid)

iss=> \d notpoll
                   Table "public.notpoll"
   Column    |          Type          |      Modifiers
-------------+------------------------+---------------------
 notpollid   | integer                | not null
 pollgrpid   | integer                |
 notgroupsid | integer                |
 alerting    | character(1)           | default 'y'::bpchar
 disuser     | character varying(50)  |
 distime     | integer                |
 alertingcom | character varying(200) |
Indexes:
    "notpoll_pkey" primary key, btree (notpollid)
    "notpoll_pollgrpid_key" unique, btree (pollgrpid)
    "notpoll_alerting_index" btree (alerting)
Triggers:
    "RI_ConstraintTrigger_2110326" AFTER INSERT OR UPDATE ON notpoll
FROM notgroups NOT DEFERRABLE INITIALLY IMMEDIATE FOR EACH ROW EXECUTE
PROCEDURE "RI_FKey_check_ins"('notgroups_exists', 'notpoll',
'notgroups', 'UNSPECIFIED', 'notgroupsid', 'notgroupsid')

I am trying to add a foreign key to the notpoll table

iss=> alter table notpoll add constraint pollgrp_exists foreign
key(pollgrpid) references pollgrpinfo on delete cascade;
ERROR:  insert or update on table "notpoll" violates foreign key
constraint "pollgrp_exists"
DETAIL:  Key (pollgrpid)=(7685) is not present in table "pollgrpinfo".

I have verified that the information is in the pollgrpinfo table:

iss=> select * from pollgrpinfo where pollgrpid=7685;
 pollgrpinfoid | pollgrpid | name | descript
---------------+-----------+------+----------
           767 |      7685 | HTTP |
(1 row)


I could use a suggestion on how to proceed in troubleshooting the error
message.  I am running 7.4.5

Thanks,
Woody

----------------------------------------
iGLASS Networks
211-A S. Salem St
Apex NC 27502
(919) 387-3550 x813
www.iglass.net