When a moderator deletes one of your posts, it will show up normally for you, but as having been deleted for everyone else. Easiest way to check is opening your posts in context after logging out or in an incognito window.

If many of your posts show as deleted, the subs mods have likely added you to their automoderator blacklist.

View the thread in a new private window. If you don't see your post, now you know why.

Check https://www.reveddit.com . It can indicate site-level or subreddit-level shadow bans.

Look at your posts from a different account?