PL/SQL Group by

Hello experts,

So it is needed to know which Owners have the most Protocols
and how many.
A query was crafted

Select owner_ID, SUM(protocol_id) as CNT
from ccm_protocol
group by owner_ID
--having SUM(protocol_id) between 1 and 601000
order by CNT desc

which returned
Owner_ID  CNT
258490      2631271323
306118      2435400026
296588      2261418059
207643      1916887537
212733      1866463289
202729      1729376813
430247      1690954678
213027      1670415116
213978      1601271602
257757      1593747213

Which blew my mind cause I think this says
that Owner_ID 258490 has 261 million protocols.
So the query was input

Select Owner_id, protocol_id
from ccm_protocol
where owner_id = 258490

which returned 1872 rows.

So there is something wrong with the GROUP BY query.

How can I get a list of OWNER_IDs with the number of
Protocols for each OWNER_ID?

Thanks.

Allen in Dallas