HULL: Did I set up something wrong?

Hey there, Sorry for the stupid issue, but I’m trying to deploy HULL through Sanity Studio, and my Shopify products won’t sync correctly. I did correctly followed the step 2, 3 and 4 (I added the variables in Vercel and not in a .env file), but when I add a product on Shopify and then sync items I got this :

store
{
  "createdAt": "2022-02-10T09:48:46Z",
  "id": 723xxxx,
  "isDeleted": false,
  "options": [
    {
      "_key": "Color",
      "_type": "option",
      "name": "Color",
      "values": [
        "Black",
        "White",
        "Green"
      ]
    },
    {
      "_key": "Size",
      "_type": "option",
      "name": "Size",
      "values": [
        "Medium",
        "Large",
        "Slim"
      ]
    }
  ],
  "previewImageUrl": "https://cdn.shopify.com/s/files/1/xxxx/xxxx/xxxx/products/xxxx.png?v=xxxx",
  "priceRange": {
    "maxVariantPrice": 68,
    "minVariantPrice": 68
  },
  "productType": "",
  "slug": {
    "_type": "slug",
    "current": "test"
  },
  "status": "active",
  "tags": "",
  "title": "Test",
  "updatedAt": "2022-02-10T09:48:50Z",
  "variants": [
    {
      "_key": "a2dd95eb-43b4-4c42-b50e-xxxx",
      "_ref": "shopifyProductVariant-xxxx",
      "_type": "reference",
      "_weak": true
    },
    {
      "_key": "04db40d1-7745-444b-a30d-xxxx",
      "_ref": "shopifyProductVariant-xxxx",
      "_type": "reference",
      "_weak": true
    },
    {
      "_key": "090894fe-55e1-4327-82e5-xxxx",
      "_ref": "shopifyProductVariant-xxxx",
      "_type": "reference",
      "_weak": true
    },
    {
      "_key": "4eddd48b-65ab-4287-832f-xxxx",
      "_ref": "shopifyProductVariant-xxxx",
      "_type": "reference",
      "_weak": true
    },
    {
      "_key": "9784fc16-3781-48a6-86ea-xxxx",
      "_ref": "shopifyProductVariant-xxxx",
      "_type": "reference",
      "_weak": true
    },
    {
      "_key": "9f8b1440-ba80-449a-a996-xxxx",
      "_ref": "shopifyProductVariant-xxxx",
      "_type": "reference",
      "_weak": true
    },
    {
      "_key": "a10e4987-dc03-43db-970c-xxxx",
      "_ref": "shopifyProductVariant-xxxx",
      "_type": "reference",
      "_weak": true
    },
    {
      "_key": "6c0565c6-2898-4e10-859d-xxxx",
      "_ref": "shopifyProductVariant-xxxx",
      "_type": "reference",
      "_weak": true
    },
    {
      "_key": "52db3a07-958a-47ff-9e70-xxxx",
      "_ref": "shopifyProductVariant-xxxx",
      "_type": "reference",
      "_weak": true
    }
  ]
}