Check the ‘postmeta’ MySQL table (in phpmyadmin, you can search for it by the post_id).
One thing I would make sure is that your field has a field reference – this will be another postmeta entry with the same meta_key as your field prefixed with an underscore (e.g. if your field name is “my_field” the reference field meta_key would be “_my_field”). The meta_value of the reference field should be something like “field_2342451923sf” – however, if it is like “temp_key_for_my_field”, your field was not saved/created correctly. If you can verify this is not the case, that would be a good first step.
