How does HN banning work? My submitted posts never appear

Hey HN!

So, I made a login for HN a few weeks back. I submitted two posts originally (ASK HN posts) and got a few responses on each one. After that, none of my posts received any attention at all (granted, they could just have been very boring). But I recently submitted a post, then logged out and checked the NEW section on HN. My submitted post was not visible! It wasn't on the NEW section at all. When I viewed my profile (whilst not being logged in), I had nothing under the "submitted posts" section of my profile.

How and why was I banned? I only had about 5 posts overall, and all were questions (no spamming of any kind).

PS- this is a new account