I am located in China and I am using a 470M gateway. I encountered the following problem

I am located in China and I am using a 470M gateway. I encountered the following problem.
I am located in China and I am using a 470M gateway. The server address is: router.cn.thethings.network. Encountered the following problems: Node data can be uploaded and platform data can be downloaded, but nodes cannot receive downlink data.
When I use the 868M gateway, the server address is: router.en.thethings.network, and the result is normal operation.