selectCallback not adding correct variant to cart (Debut theme)

[Fii]

Hi

I'm looking for some help on this issue.

I've added a `selectCallback` function to my product template to show a sold out/lead time message on variant select (all products can be bought after they've sold out), but now the correct variant isn't being added to the cart.

var selectCallback = function(variant, selector) {
  if (variant) {
    if (variant.inventory_management && variant.inventory_quantity <= 0 && variant.available) {
      console.log('variant sold out but can still buy')
      leadTimeMessage.innerHTML = "{{ 'products.product.sold_out_lead_time_message' | t }}"
      addToCartButton.removeAttribute('disabled')
      addToCartButtonText.innerHTML = "Add to cart"
    } else if (variant.available) {
      // Selected a valid variant that is available.
      console.log('Selected a valid variant that is available');
      leadTimeMessage.innerHTML = ""
      addToCartButton.removeAttribute('disabled')
      addToCartButtonText.innerHTML = "Add to cart"
    } else {
      // Variant is sold out.
      console.log('Variant is sold out')
      leadTimeMessage.innerHTML = ""
      addToCartButton.setAttribute('disabled', 'disabled')
      addToCartButtonText.innerHTML = "{{ 'products.product.sold_out' | t }}"
    } 
  } else {
    // variant doesn't exist.
    console.log('variant doesnt exist')
    leadTimeMessage.innerHTML = ""
    addToCartButton.setAttribute('disabled', 'disabled')
  };
}

I've been reading this: https://shopify.dev/tutorials/customize-theme-use-products-with-multiple-options, but my understanding is that it should be working straight away (ie, correct variant being added to the cart).

My example:

The way it's currently working is like so:
• First variant shown can be added to cart (Size 1)
• Go back to product + select a different variant
• First variant gets added to cart again

Is there something I'm missing in my `selectCallback` function? When I remove the function from my JS file, all selected variants are added as expected.

Any help would be great, thanks!

[Fii]

Ignore this. 

Got it working and the above doesn't make sense.

[Vega_Moon_Techn]

Please Replace Swatch.liquid code with this