1 is irrelevant, or your speech is inconsistent with the theme of the post bar;
2 Posts containing illegal content, or posts containing words that Baidu considers sensitive, may be deleted or swallowed;
Your post is considered as irrigation by the system.
It is inevitable that it was deleted by mistake by the system. You can go to the Post Bar Complaint Center to complain.
As long as you actively build a post bar and are familiar with the rules, the probability that the post will be deleted will become smaller and smaller.