Hmmm... this is kind of odd. Your posting history stacks up as follows:
- One zero-score deleted question
- One zero-score deleted-and-closed question
- One zero-score migrated question
- One positive-score closed/on hold question
- One zero-score open question
- Three upvoted open questions
That seems like a perfectly reasonable set of questions to me. So I would say you should ignore the warning...
...except that this warning is part of an automated system, and not something that can be manually overridden. It indicates that you're getting close to some threshold of an overall question quality score. I don't know the formula for this score, nor the threshold, and I'm a little surprised that your questions come close to it, but regardless, if you do happen to run over the threshold, the fact that it seems strange isn't going to help you.
My advice is to keep posting, and don't take the warning as a sign that you're doing anything wrong, but just be a little bit more cautious about your next couple questions. Don't ask "risky" questions; instead, stick to asking things that you're reasonably confident will not get downvoted, and that you won't want to delete later on. Considering that none of your other questions are downvoted, this shouldn't be a problem.