shipping fee can't update automatically.

Hi everyone,

I was testing the checkout system and i accidentally found a shipping fee calculation mistakes.

I added item A to my shopping cart and click on check-out. The total shipping for A is 6 dollars but i didn’t check out directly, instead, i went back to the store and added many other items.then i clicked check-out again.

BUT the shipping fee is still 6 dollars no matter how many items i have added at the second time and I click on “Process” there was no error msg appeared .

PS. When i click “Update” and it finally calculate the right shipping fee from 6 dollars to 60 dollars .

If i don’t click on update I can still check-out but pay only shipping fee for the first item. The system will not update automatically.

Anyone has a solution for this?:o

Thank you!