Not able to persist cart data

[rohitsarohamobi]

Hi, I am using shopify/hydrogen to create a website. I ran into one problem while creating cart functionality. Let's say I added products on one device while I am logged in.

Then I try to login on another device but data returned from useCart() hook is not same as previous device the items differ for both the devices in cart.

Here is my cartProvider code

<CartProvider cartFragment={CART_FRAGMENT} 
        customerAccessToken={customerAccessToken}
        >
        <Router>
          <FileRoutes />
        </Router>
        </CartProvider>

I have added one mutation also to update buyerIdentity in cart using customerAccessToken

mutation cartBuyerIdentityUpdate($buyerIdentity: CartBuyerIdentityInput!, $cartId: ID!) {
  cartBuyerIdentityUpdate(buyerIdentity: $buyerIdentity, cartId: $cartId) {
      cart {
        id
      }
      userErrors {
        field
        message
      }
    }
  }

My mutation seems to be working fine when I use useCart hook since I am able to see buyerIdentity coming up.

This is how I am getting from useCart() hook
const {lines} = useCart();

But when I try to login I get same customerAccessToken on different devices but why my line Items differ. Can anyone help me solve this issue.