Recently, Google's PR has started a large-scale update, and Xiao Hu's blog has also been promoted to PR4.
The last PR update of Google lasted for six months, while this time it was only two short months. Google is becoming increasingly difficult to figure out. Moreover, have you noticed that Google's crawling speed has become incredibly fast? As long as it's a new article, it can be indexed in as fast as 10 minutes. Xiao Hu observed for a period of time, and indeed, the page crawling ability of Googlebot is gradually improving.
In other words, Google is beginning to strengthen the protection of original content. The faster new articles are indexed, under the same circumstances, whoever publishes first will be considered the original, and those published later will be penalized with reduced weight (this is just a guess). This move by the big boss of Google is pretty ruthless. Support!!