That is a pretty large field group, and I can’t see what all of the field types are due to the errors, are some of them repeaters or flexible content with nested fields?
Running into trouble with the php setting max_input_vars can cause strange results.
Try installing this plugin: https://wordpress.org/plugins/wp-max-submit-protect/
It will tell you if there are more fields being submitted than is allowed. This is actually what I initially suspected.
