Hi Kihra and all 
On classic (Azuresong) there is zero progress listed for the Double Dragons kills in BWL as it says that all logs for the encounter are private. But our logs always have visibility set to public.
EG: https://classic.warcraftlogs.com/reports/jNVnpby9Z1WJq2PY
When I search for character progress on the server, each of our raiders have the kills listed in their profiles. So it seems to be a server vs character issue.
Edit: On a related note, is it intentional to not award all star points for the double dragons kills? As you lose any opportunity for all star points on each individual dragon for the week when you clear them together.