Even if it turns out that a comment was indeed deleted, it may happens that it reappears in the online search results. In particular, when one or more internet users use the main search engines as Google, Yahoo, Bing or Yandex. This can be explained by the fact that these engines save the search history and memorize a stack of data. These robots need some calculation time to reindexing the content of a site. Sometimes this needs some minutes, others it takes several months.This depends on the search engine, its algorithm and its artificial intelligence abilities.