FC-918E access control smart card lock is taken from your company, card is taken from another card factory. Why dozens of cards in a pack can not be read when add the cards?

Hello, when our FCL-918E access control smart card lock in production testing. There are strict testing processes, we strictly carry out 125 KHZ read card frequency. There are a lot of inferior cards resulting from the competitive price. Using the non-standard material leads to different quality, so we can't read the cards. Therefore we strongly recommend purchasing good-quality cards from formal channels and if you do that, you can avoid this kind of problem.