Not entirely sure why you appear to be shadowbanned (nothing looked egregious in a quick scan of past comments), so I vouched for this comment so it shows for people that don't have showdead on.

Maybe it's that most your comments are very short and single sentences and it's triggering some automated system looking spam as a false positive? Maybe it's worth being slightly more verbose in replies for a while, in case that's it. I assume if you get enough people vouching for comments the ban reverses itself, but I don't really know. You could also email hn and ask why.