Move counter?

Question

C++ / C#

Hello. Could you tell me how to implement the counter of moves correctly? In my written code, it turns out that the moves are counted incorrectly. Either they add, then they decrease, or they can even add / decrease for a couple of moves. And I need the counter to add moves by 1 unit.
The actual code

if (cardBack.activeSelf && controller.canReveal) {	
cardBack.SetActive(false);						
controller.CardRevealed(this);                
            Moves += 1f; // тут прибавляю в счетчик +1

.
code from the second script

public bool canReveal
    {
        get { return _secondRevealed == null; }                                  
    }
public void CardRevealed(MemoryCard card)
    {
        if (_firstRevealed == null)
   {  
 _firstRevealed = card;
        }
        else
        {
            _secondRevealed = card;
            StartCoroutine(CheckMatch());
       }

Answer 1

Why is the move counter float? It's kind of illogical.