Line Item appearing Duplicate Tax Lines

[trisha-3]

Hi all, 

Why am I seeing tax_lines being duplicated when there should only be one? This happens usually when a subscription app is installed but I don't have a subscription app installed in my case.

Order's 

"source_name":"web"

Affected Order Line Item (Redacted info)

{
                    "id": 00000000000000,
                    "admin_graphql_api_id": "gid://shopify/LineItem/33333333333333",
                    "name": "YYY",
                    "price": "9.00",
                    "product_exists": true,
                    "product_id": 2222222222222,
                    "quantity": 2,
                    "sku": "19487",
                    "taxable": true,
                    "title": "XXXXX",
                    "total_discount": "0.00",
                    "variant_id": 11111111111111,
                    "tax_lines": [
                        {
                            "channel_liable": false,
                            "price": "0.90",
                            "rate": 0.1,
                            "title": "GST"
                        },
                        {
                            "channel_liable": false,
                            "price": "0.90",
                            "rate": 0.1,
                            "title": "GST"
                        }
                    ]
}