Can't update product price via API

I am trying to update a product's price through the API (https://swell.store/docs/api/#update-a-product). However the price does not update. Below is an example response when trying to update a price from $500 to $650. The price field is updated to the new value ($650) in the response object, but the purchase_options.standard.price , and the $currency.USD.price are still the old value. Then when I retrieve the product again (https://swell.store/docs/api/#list-all-products), the price is still the original value ($500).

Example Request Body:

{
  id: 'swell-product-id',
  price: 650,
}

Example Response:

{
  attributes: {},
  name: 'PRODUCT_NAME',
  price: 650, // <-- updated price
  seller_id: 'seller-id',
  currency: 'USD',
  slug: 'post-slug',
  date_created: '2022-03-09T09:45:04.824Z',
  active: true,
  stock_status: null,
  date_updated: '2022-03-22T09:13:26.358Z',
  description: null,
  images: null,
  meta_description: null,
  meta_title: null,
  options: [],
  prices: [],
  purchase_options: {
    standard: {
      active: true,
      price: 500, // <-- old price
      sale: false,
      sale_price: null,
      prices: [],
      '$currency': [Object]
    }
  },
  sale: false,
  sale_price: null,
  sku: null,
  tags: [],
  variable: false,
  id: 'swell-product-id',
  '$locale': {
    'en-US': {
      name: 'PRODUCT_NAME',
      description: '',
      tags: [],
      meta_title: '',
      meta_description: ''
    }
  },
  '$currency': { USD: { price: 500, sale_price: '' } } // <-- old price
}