If the store has little inventory or the discount is too big, the purchase quantity will be restricted. This is normal. You can buy according to the regulations.

Perhaps some of your bad behaviors on Douyin have caused you to be unable to carry out a purchase activity in some stores on Douyin. So being restricted means that your reputation is not good and your integrity has suffered a certain loss. In this case, it will affect your shopping rights on Douyin, and you will not be able to carry out normal information in some stores, and a normal transaction of the goods you purchased.