Why are there 2 shipping settings on the preference page?"

There are 2 shipping fees settings available on the app:

"Shopee Buyer Shipping" is the regular shipping price that is charged to the buyer and will appear as a shipping cost on the Shopify order.

"Shopee Shipping Fee" is the shipping fee that Shopee charges to you, the seller if you choose to bear the shipping cost.

If you would like the orders imported to accurately reflect the shipping cost, please enable both shipping fee settings.