The first and 2nd times, I have tried to clear the browsing data in the past day (chrome). I still can't add the products to the shopping cart.
Today, I have cleared the browsing data from the beginning (All previous data), then I can add the products to the shopping cart (chrome) again.
However, when I closed chrome and re-opened it and I couldn't add the product to shopping cart again and I found that there was 1 product in the shopping cart which was added from previous testing.
After that I have removed the product from the shopping cart and tried to add a new product to shopping cart and it was successfully.
Here after, I wanted to re-produce the bug again but it was failed. There is no problem right now.
In conclusion, abantecart should pay more attention on the storefront basic functions and features and make abantecart more reliable. Besides, I also want abantecart to fix the long product description (description more than 1 screen page with html content) in the default template (can't display product listing properly with long product description, I have suggested to add a short text description in the past). Moreover, I also want abantecart to implement the address format for different countries in the backend admin and storefront, so that admin user can set the address format which can include or exclude the zip code/postal code, states, etc for the specified country (implement it at registration, edit address, etc.).
Hope to see abantecart become more reliable, efficient, popular and completed shopping cart system.