First, the website violated the search engine algorithm rules and was punished, resulting in the disappearance of the collection.

Second, the original source code and content of the website template are low, and the second search filtering of the search engine leads to the disappearance of the website page.

Thirdly, the frequency of website content update is low, the updated content is few, the visitor experience is low and the bounce rate is high, which leads to the disappearance of included pages.

Fourth, the website server is unstable, and the connection data is often lost, which leads to the disappearance of the included pages again.

The above are the common factors that search engines disappear again on the included pages!