C# basics cant be purchased

Jak vyvolat chybu: Profile: https://www.itnetwork.cz/portfolio/77217

First problem started when he said that he is not able to read premium articles in C# basics section - he claimed that he already bought them. I checked his profile and find out that he dont have them in his purchases. So i told him.

Chybné chování: Now he is not able to purchase them - the system is saying that he already owns them. Seems weird - already got similar problem like that. Did we make any changes in article licences??

Předpokládané chování: ?