Own the markup. Keep checkout in charge.

{%- assign campaign_id = section.settings.campaign_id | strip -%}
{%- assign config_key = 'sfc_' | append: campaign_id -%}
{%- assign cfg = shop.metafields.cinch[config_key].value -%}
{%- assign item = cfg.disp.first -%}

{%- if cfg -%}
{%- if item -%}
<script id="cinch-config" type="application/json">
  {{ cfg | json }}
</script>

<section data-cinch="cinch-config">
  <button
    type="button"
    data-bundle-toggle="{{ item.id }}"
    data-bundle-product="{{ item.pid }}"
    aria-pressed="false"
  >
    Add {{ item.t | escape }}
  </button>

  <p><span data-bundle-out="count">0</span> items selected</p>
  <p data-bundle-out="message"></p>
  <button type="button" data-bundle-submit>Add bundle to cart</button>
</section>
{%- endif -%}
{%- endif -%}