it would appear that the configuration applied is that of /etc/amavis/conf.d/50-user

$sa_tag_level_deflt  = 2.0;  # add spam info headers if at, or above that level
$sa_tag2_level_deflt = 6.2;  # add 'spam detected' headers at that level
$sa_kill_level_deflt = 6.9;  # triggers spam evasive actions (e.g. blocks mail)
$sa_dsn_cutoff_level = 10;   # spam level beyond which a DSN is not sent

# SPAM.
$final_spam_destiny = D_DISCARD;
$spam_quarantine_method = 'sql:';
$spam_quarantine_to = 'spam-quarantine';

In fact, the SPAM tag in the subject is also added to the messages in the Junk even if the option "Prefix text [SPAM] to the subject of spam" in IredAdmi is disabled.

so if I understand correctly
since all values  of @. are NULL in the policy table, the amavis 50-user configuration is loaded.

to disable the quarantine, I raise the value of sa_kill_level_deflt?  from the panel or by editing the file 50-user?

Thanks