Why is a post hidden behind a sensitive-content warning?

Either a moderator marked it, or enough different members reported it as sensitive for it to be flagged automatically. The flag hides the content behind a warning rather than deleting it, so you can still choose to look.

If you think your own post was flagged wrongly, ask the club's moderators to review it — they can clear the flag. Reporting a post repeatedly from the same account does nothing extra; the automatic flag counts distinct people, not repeat reports.