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.
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