Data missing in some columns in JSON preview

[CherryDT]

See screenshot:

As you can see, the phone and ctecId columns are missing their data in the preview.

This is the JSON data:

[
  {
    "prontoId": 0,
    "email": "[email protected]"
  },
  {
    "prontoId": 1,
    "email": "[email protected]"
  },
  {
    "prontoId": 2,
    "email": "[email protected]",
    "phone": "1234567890",
    "ctecId": "A123456"
  },
  {
    "prontoId": 3,
    "email": "[email protected]",
    "phone": "0987654321",
    "ctecId": "A654321"
  },
  {
    "prontoId": 4,
    "email": "[email protected]"
  },
  {
    "prontoId": 5,
    "email": "[email protected]",
    "phone": "1112223333"
  }
]