Must have happened to me. I did a post once about a hypothetical nefarious act in a "what if" context and it disappeared.
I own 4 different online forum systems devoted to other subjects besides gun and the bots are simply search engine crawlers who index your website and some of the posts on the website for placement in search engines.
Forum owners can switch different access levels to the bots in their forum administration area or completely deny access to certain bots. The bots automatically crawl the web 24/7/365.
None of us actually have access to what ever the bots are gathering about our websites.