User not being added to site after posting Q&A question/answer and registration

Is this behaviour normal in a multisite install wiith Q&A plugin:

After a visitor posts a question/answer on a subdomain they are directed to a registeration page on the root domain. After going through the registration process they are redirected to the home page of the root domain and are not added as users to the subdomain on which they posted the question.

I want visitors who post a question to regsiter and become users of the domain in which they posted the question and to remain on the subdomain, ideally being redirected to their question/answer.

Thoughts? :slight_smile: