Why are some of my comments not visible to others?

A good number of my comments are only visible to me. Is there something I'm doing wrong? I don't think I'm banned from that subreddit.

Example: https://www.reddit.com/r/science/comments/35hfrv/fresh_evidence_for_how_water_reached_earth_found/cr59olt

It's probably a stupid comment, maybe a mod made it invisible?

edit:
It was deleted by the automoderator, a mod restored it. I didn't know the poster couldn't see it when their posts are removed.