Two started cluster on the same data directory and port

Hi!

I have this situation on a server that is giving me problems.

postgres@hostname:~$ pg_lsclusters
Ver Cluster  Port Status Owner    Data directory              Log file
14  main     5432 online postgres /var/lib/postgresql/14/main
/var/log/postgresql/postgresql-14-main.log
14  main_old 5432 online postgres /var/lib/postgresql/14/main
/var/log/postgresql/postgresql-14-main_old.log

How can I stop, even delete, the main_old cluster?

Thanks!