I am trying to configure a 2x quick smelt where the food does not burn. This is my config 

{
  "Use Permission": true,
  "Speed Multipliers": {
    "global": 2.0,
    "furnace.shortname": 1.0
  },
  "Fuel Usage Speed Multipliers": {
    "global": 0.5,
    "furnace.shortname": 1.0
  },
  "Fuel Usage Multipliers": {
    "global": 0.5,
    "furnace.shortname": 1
  },
  "Output Multipliers": {
    "global": {
      "global": 1.0
    },
    "furnace.shortname": {
      "item.shortname": 1.0
    }
  },
  "Whitelist": {
    "global": [
      "item.shortname"
    ],
    "furnace.shortname": [
      "item.shortname"
    ]
  },
  "Blacklist": {
    "global": [
      "wolfmeat.cooked"
      "bearmeat.cooked"
      "chicken.cooked"
      "deermeat.cooked"
      "fish.cooked"
      "horsemeat.cooked"
      "humanmeat.cooked"
      "meat.pork.cooked"

    ],
    "furnace.shortname": [
      "item.shortname"
    ]
  },
  "Smelting Frequencies (Smelt items every N smelting ticks)": {
    "global": 1,
    "furnace.shortname": 1
  },
  "Debug": false
}​

I am confused about why some of the beat is auto burning. 

https://vimeo.com/user109145497/review/394682201/3e5fc5ca76

This is the same with all methods of cooking food e.g. campfire

Does anyone have a fix for this?

I have the same problem .. how did you solve it?

In the config file make sure the fule usage multiplier is 1: 
 
From
"Fuel Usage Multipliers": {
"global": 0.5,
"furnace.shortname": 1
},

To
"Fuel Usage Multipliers": {
"global": 1,
"furnace.shortname": 1
},