We can only see our own warning levels, it's nothing to fret about.
Generally on forums, the "Warning Level" is in case you post something offensive/insulting/etc many times and an admin/moderator can continue to "warn" you via that option; it allows them to keep track of your forum violations. As a forum moderator, I've seen people get forum perma-banned if their warning level gets to 100%.
Certain forum software adds this by default which is what I'm guessing KittyCatS has as I don't see any mods or admins ever using the feature (or needing to).