Hi Dung - This could be a number of things including the type of element that was used to grade a particular question. Can you send an original link (not customized) to our customer support and there we can look more carefully at why this has happened. Thank you!
Hi Dung - This could be a number of things including the type of element that was used to grade a particular question. Can you send an original link (not customized) to our customer support and there we can look more carefully at why this has happened. Thank you!
What the answers?