Thanks for reporting it. We use javascript to calculate FBA on the extension now and use Amazon API in our site.
The Javascript is unreliable because it parses the item dimensions from the page. We can't use API on the extension because we had way too many downloads and the Amazon API is throttled.
We are working around both issues and our next update will have more precise calculation
The Javascript is unreliable because it parses the item dimensions from the page. We can't use API on the extension because we had way too many downloads and the Amazon API is throttled.
We are working around both issues and our next update will have more precise calculation