They have been reported for whatever reason and the Ab Ed agrees and pulls the question. Unfortunately any answers that you have given appear on your banned list.
Moderating a similar place myself, we have house rules set by the owner, and we nearly always email the member who's post has been deleted to explain the reasons to avoid any speculation or accusations of arbitrary action. As the rules on each site are up to the owner, anyone who wants it here can now suggest it if they think members should be told in private why their post has been delteted.