Why isn't my product update reflecting on API?

hello, i’m trying to update my products through api, it return success. but the product is not updated on shopify. as you can see from the response the title is already changed to UGG Australia Boots Blacktes. but when we get the item, it’s still not changed UGG Australia Boots Black

PUT: https://baltini-staging.myshopify.com/admin/api/2023-01/products/7684137713816.json

this is the body

{
    "product":{
        "id": "7684137713816",
        "title": "UGG Australia Boots Blacktes",
        "body_html": "\n            <b>Gender:</b> Woman<br>\n            <b>Material:</b> -<br>\n            <b>Color:</b> Black<br>\n            <b>Made In:</b> -<br>\n            <b>Product ID:</b> 1199795<br>\n            <i>*Import tax/duty will be calculated at checkout (If applicable)</i>\n        ",
        "vendor": "UGG Australia",
        "product_type": "Boots",
        "status": "active",
        "tags": "Supplier: AtelierOnWeb, UGG Australia, ProductID: UGSBLBOWMBK1016501WBLACK, WOMEN, Category: SHOES, SubCategory: BOOTS, SHOES, BOOTS, COLOR: BLACK, Origin: , Material: , Autumn 19, Season: Autumn 19, Supplier: Leam",
        "variants": [
            {
            "title": "BLACK",
            "price": "237.6000",
            "compare_at_price": null,
            "barcode": "211426321250",
            "sku": null,
            "inventory_management": "shopify",
            "weight": null,
            "inventory_quantity": 0,
            "id": "42793347383448",
            "metafields": [
                {
                "key": "external_id",
                "value": "1199795",
                "type": "single_line_text_field",
                "namespace": "productVariant"
                }
            ],
            "option1": "37"
            },
            {
            "title": "BLACK",
            "price": "234.9600",
            "compare_at_price": null,
            "barcode": "201772264350",
            "sku": null,
            "inventory_management": "shopify",
            "weight": null,
            "inventory_quantity": 0,
            "metafields": [
                {
                "key": "db_id",
                "value": "9a01103c-1024-4f67-b868-2afccc50c416",
                "type": "single_line_text_field",
                "namespace": "productVariant"
                },
                {
                "key": "external_id",
                "value": "1199827",
                "type": "single_line_text_field",
                "namespace": "productVariant"
                }
            ],
            "option1": "39"
            }
        ],
        "options": [
            {
            "name": "size",
            "values": [
                "39",
                "37"
            ],
            "position": 1
            }
        ]
    }
}

This is the response

{
  "product": {
    "body_html": "\n            <b>Gender:</b> Woman<br>\n            <b>Material:</b> -<br>\n            <b>Color:</b> Black<br>\n            <b>Made In:</b> -<br>\n            <b>Product ID:</b> 1199795<br>\n            <i>*Import tax/duty will be calculated at checkout (If applicable)</i>\n        ",
    "status": "active",
    "title": "UGG Australia Boots Blacktes",
    "vendor": "UGG Australia",
    "id": 7684137713816,
    "product_type": "Boots",
    "created_at": "2023-08-29T14:09:30+07:00",
    "handle": "ugg-australia-boots-black",
    "updated_at": "2023-08-30T13:54:47+07:00",
    "published_at": "2023-08-29T14:09:30+07:00",
    "template_suffix": null,
    "published_scope": "web",
    "tags": "Autumn 19, BOOTS, Category: SHOES, COLOR: BLACK, Material:, Origin:, ProductID: UGSBLBOWMBK1016501WBLACK, Season: Autumn 19, SHOES, SubCategory: BOOTS, Supplier: AtelierOnWeb, Supplier: Leam, UGG Australia, WOMEN",
    "admin_graphql_api_id": "gid://shopify/Product/7684137713816",
  }
}

Hello @jessicadihardja ,

Thank you for reaching out to the Shopify community.

It seems like, you have to use the product variants update API to update the variants of the product separately, please check the reference document here to create a new variant, or to update the variant.

Let me know if the issue persists even after using the product variant API.

Thanks.