(OP is not asking about the frontpage, but rather about https://news.ycombinator.com/ask, which shows text posts, mostly questions that usually begin with "Ask HN".)
I don't regularly check Ask HN so I'm uncertain that more should be listed, although I would expect so. But assuming you haven't, the correct place to contact is hn@ycombinator.com which can be found at the contact link at the bottom of the page.
The answer is that not enough posts are getting upvoted on https://news.ycombinator.com/asknew (or https://news.ycombinator.com/newest) to clear the small threshold necessary to make it to /ask.
https://news.ycombinator.com/item?id=49659647
I never use this section, though.
Is it based on browser? I'm running Google Chrome.
Also, the site is loading really slow for me now.