<Moving item to front of ArrayList leaves me with ...

# stackoverflow

[user]

Moving item to front of ArrayList leaves me with 2 items at index 0?
I have an ArrayList using Kotlin:
0: Abe
1: Baby
2: Cecil

I have code that automatically fires when an item in this list has changed. Every time an item changes, I want to move it to the top of the list, and I try to do it like this:
//Find item that was updated
val index = matchesArrayList.indexOfFirst{
it!!.matchUserID == matchUserID
}

Log.d(TAG, "Index A: $index")...