Problem changing variable names in Server Connect

I came across something similar a while ago but thought it had been fixed.

I duplicated several server connect files and copied them to a new folder. I was going to use similar actions with a second table. There was no problem with the first file.

In the second file, there were two post variables which I wanted to rename. No problem. I then edited the query to change the table and edit the POST variables. The moment I did this, the POST variables copied themselves:

I edited the file directly, deleting the duplicate variables which appeared like this:

{
  "meta": {
    "options": {},
    "$_POST": [
      {
        "type": "text",
        "name": "authsubj_name"
      },
      {
        "type": "text",
        "name": "authsubj_dates"
      },
      {
        "type": "text",
        "name": "authsubj_name"
      },
      {
        "type": "text",
        "name": "authsubj_dates"
      }
    ]
  },

However when I saved the file, the duplicates reappeared. I decided it might be simplest to delete the variables and re-enter them. After I deleted the first one, the $_POST option disappeared:

I closed Wappler, edited the file in a text editor. All was back to normal when I reopened Wappler. I then did the same with another file - same problem and same fix.