The accounts tab on my network profile page doesn't show any questions or answers at area51:
However, my Area51 user page does show that I have 3 questions and 1 answer:
Why aren't those shown in the network profile page?
This isn't a bug really. This is how it appears for everybody. I have over 3800 reputation on Area 51, and no questions or answers are listed for me either.
This is because we're not really asking questions, and there are no answers to post. Area 51 is a staging area for new Q&A sites, and on Area 51, users gain reputation from creating new proposals and writing good, on-topic example questions.
What's more, you're actually referring to the Discussion part of Area 51, which is more like a per-site Meta than it is an actual parent site. Per site Meta questions and answers aren't displayed in your list of accounts, with the sole exception of Meta Stack Overflow. Therefore, the questions that you have displayed in your screenshot are actually from the Discussion (or meta) part of Area 51, not the main Area 51.
In short, this is by design.