Old question, but for anyone looking for the same type of information.
field_effect is a special case. This will cause a problem because it conflicts with ACFs field key names. In newer versions of ACF5, ACF will not let you begin a field name with field_
As far as the others go, most likely the names are conflicting with something else in WP. It could be anything from the name of a custom post type or taxonomy to another plugin already using these field names.
Welcome to the Advanced Custom Fields community forum.
Browse through ideas, snippets of code, questions and answers between fellow ACF users