One of my experiences was that after successfully refunding the ticket on 12306, I purchased the same train with the same ID 17 minutes later. Maybe the system needs a certain reaction time
About 30 minutes before posting this blog, I bought a high-speed train from Shenzhen to Yueyang at 14:10 on 12306 with my ID card. Later, my friend said he wanted to take a bus with me back, so I took me The ticket was refunded, and the ticket was successfully refunded at 14:12, and the money was refunded to Huabei on my Alipay.
Then at 14:13, I used my friend's and me ID to buy the same high-speed train before and chose our seats together. The result showed that the ticket was unsuccessful, and my ID card had already purchased the bus for this day. I tried several times in a row and it was prompted that the ticket wassuance failed. I have already bought this train
I tried again at 14:29 and the ticket was issued successfully.
The same ID card, the same day, the same time and number of trains, after the refund is successful, the ticket is successfully purchased 17 minutes later, this is my experience this time.