I recently ran into an issue where I saw a number of posts showing up in WordPress called “Unititled_1”, “Unititled_2” and so on.
No author, no content, nothing that gave me any real clue…until I looked in the postmeta and saw gravity form IDs related to it as well as a value for one of my form fields.
That gave me enough information to then look at the form and to check all the form field types. Sure enough – one of my set of checkboxes were not the standard form fields – it was marked as a “Custom Field” form field. Therefore – every time someone filled out and submitted the form, a new post with only the poset meta for that custom field was created.
Verify you also see the custom field data either by looking at the DB or by going to Screen Options > Custom Fields (checked) and then look at the meta data there. Once you verify which form, and which field ID is responsible for this – edit the form, and switch the form field type.
You will want to do an export before removing the field so if you need to recreate that field input – you will have the data. (Once you delete the field – the data will also be deleted.