[This is covered in the help pages][1]

Fact is there's no manual way for a moderator to undo a question ban.
You have 12 deleted questions (and from a quick look through, I can't really see anything that can be salvaged) and 2 non deleted questions *all of which are zero score*. Many of these are abandoned (and as such deleted automatically) or self deleted. 

This is the system working more or less as designed and *no human moderator* was involved in this decision.

Typically I go through questions and say "Hey, you should fix these questions" - though nothing really comes to mind from your list. 


  [1]: http://superuser.com/help/question-bans