Was trying to import some environments I created in puppet.conf:

    #/etc/puppet.conf

    [main]
    # The Puppet log directory.
    # The default value is '$vardir/log'.
    logdir = /var/log/puppet

    # Where Puppet PID files are kept.
    # The default value is '$vardir/run'.
    rundir = /var/run/puppet

    # Where SSL certificates are kept.
    # The default value is '$confdir/ssl'.
    ssldir = $vardir/ssl

    [agent]
    # The file in which puppetd stores a list of the classes
    # associated with the retrieved configuratiion. Can be loaded in
    # the separate ``puppet`` executable using the ``--loadclasses``
    # option.
    # The default value is '$confdir/classes.txt'.
    classfile = $vardir/classes.txt

    # Where puppetd caches the local configuration. An
    # extension indicating the cache format is added automatically.
    # The default value is '$confdir/localconfig'.
    localconfig = $vardir/localconfig

    [master]

    external_nodes = /etc/puppet/external_nodes.rb
    node_terminus = exec
    modulepath = /etc/puppet/modules
    manifest = /etc/puppet/manifests/unknown_environment.pp

    [production]
    manifest = /etc/puppet/manifests/site.pp
    modulepath = /etc/puppet/environments/production/modules

    [dev]
    manifest = /etc/puppet/manifests/site.pp
    modulepath = /etc/puppet/environments/dev/modules

    [qa]
    manifest = /etc/puppet/manifests/site.pp
    modulepath = /etc/puppet/environments/qa/modules

    [root@qa-mgmt foreman]# rake puppet:import:puppet_classes RAILS_ENV=production
    (in /usr/share/foreman)
    Evaluating possible changes to your installation
    Scheduled changes to your environment
    Create/update environments
    master : blackboard::common, core::mail, core::services, cpfusion::appserver, cpfusion::common, cpfusion::dbserver, cpfusion::fileserver, cpfusion::logging::local, cpfusion::logging::remote, cpfusion::maintenance, func::client, glassfish, glassfish::logserver, httpd::base, iptables::common, nfs::server, ntp::client, openssh::server, pgbackup::oldclient, pgbackup::snapshot, postgres::cpfusion, postgres::logserver, postgres::server, rsnapshot::client, rsnapshot::server, rsyslog::base, rsyslog::client, rsyslog::server, snmp::client, sudo, users::common, users::cpfadmins, users::cpfdevs, users::glassfish, webmin, yum, zabbix::agent, and zabbix::proxy
    qa :
    dev :
    Delete environments
    production : Remove environment

    Proceed with these modifications? <yes|no> no

As you can see it's trying to overwrite "production" and replace it with "master." Seems odd. Import the environment in the UI doesn't report any error.