When you buy something on Douyin, sometimes the details page will show a network error. This may be due to the following reasons:

1. Network connection problem: Your mobile phone network connection may be unstable, or your phone does not have enough network bandwidth to access the website.

2. Server problem: The website may not be able to provide services due to server problems.

3. Cache problem: Your device may have a cache, resulting in an inability to access the latest information.

4. DNS resolution problem: Your device requires DNS resolution to access the website, but the DNS resolution may be faulty.

5. Problems with e-commerce platforms such as Taobao/JD: If you buy products from e-commerce platforms such as Taobao or JD on Douyin, then there may be problems with these platforms, resulting in your inability to purchase products normally.