Multiple dropdown values issue

a!localVariables(
  
  local!choiceValues: cons!VS_VALUES(list of array : "AB","BC","CD",)
  local!dropDownValue,
  local!value,
  a!multipleDropdownField(
    choiceLabels: local!choiceValues,
    choiceValues: local!choiceValues,
    value: local!value,
    saveInto: {
      a!save(
        local!value,
        if(
          contains(
            save!value,
            index(local!choiceValues, 1, {})
          ),
          0,
          save!value
        )
      ),
      a!save(
        local!dropDownValue,
        if(
          contains(
            save!value,
            index(local!choiceValues, 1, {})
          ),
          remove(local!choiceValues, 1),
          save!value
        )
      )
    }
  )
)

Hi All. Hope you all are doing well. 

I am using multiple dropdown and working with records. The above code i am trying to edit already present value in the multiple dropdown. Above is the code . 

If i try displaying the selected value i am unable to deselect it and select new values and if i am able to do it i am unable to display already present value . 

Can anyone please help me with the point i am missing ?

Thank you very much in advance.