Data table view, duplicate columns

OK, I see the problem. Despite the submission content looking like:

{
  "_notes": [],
  "assess/Case_Identified": "choice_for_registration_place",
  "_bamboo_dataset_id": "",
  "_tags": [],
  "_xform_id_string": "aA7JqbjchAQinqd6nuVAUg",
  "assess/District": "choice_for_district",
  "meta/instanceID": "uuid:37ae1d26-8cea-445c-8085-cd771959c33a",
  "assess/GB_Condition": "choice_for_yes_no",
  "assess/Disability_Status": "choice_for_disability_status",
  "_geolocation": [
    null,
    null
  ],
  "_status": "submitted_via_web",
  "__version__": "vGszHuDE7b6yo5Ta8KuirJ",
  "assess/Vulnerability_Risk": "choice_for_risk",
  "_validation_status": {},
  "assess/Vulnerability_Criteria": "choice_for_vulnerability",
  "_uuid": "37ae1d26-8cea-445c-8085-cd771959c33a",
  "assess/Vulnerability_Notes": "okay",
  "assess/Staff": "choice_for_case_worker",
  "_submitted_by": null,
  "assess/Case_Registration_Date": "2019-04-15",
  "assess/Risk_Level": "choice_for_risk_level",
  "formhub/uuid": "7bbe32bb284848158fc4f2b3f6c93376",
  "assess/Case_Code": "abcdefg",
  "_submission_time": "2019-04-15T19:15:04",
  "assess/ID": "11111111111",
  "_attachments": [],
  "_id": 25963039
}

…where there’s clearly one assess/ID response, the table view exhibits the problem described by @mskaraca:


Trying now with a minimal form.