It says “Cart has been updated” and I cannot add certain eBooks to cart.
It is possibly due to either of the reasons below.
It is possibly due to either of the following reasons:
1)Changes to “distribution period”, “price”, etc might have occurred.
In this case, please check the revised information and you will be able to add those eBooks to cart again.
2) You are accessing from a country where the applicable eBooks are not available.