Why does reddit do this

So I’m using my account normally and everything is fine. In the majority of places I can post. Then I post in a specific subreddit, it says removed by Reddits filters and now my account is just shadowbanned and gone for no reason. I didn’t break any rules and didn’t even intend to and now I can’t use the site. What is the point and has this happened anyone else? Why does it do this?