In previous versions of CGHeadmaster, the default for meta titles in fields.ini
was:

dflt="{$config.title|default:\"{title} - {sitename}\"}"

In CGHeadmaster 1.0.12 the default setting is changed to:

dflt="{$config.title|default:\"{title}\"} - {sitename}"

Which always adds Sitename to meta titles, even if you try to override the
default value.