Your question still has 2 upvotes. One upvote was removed and two downvotes were added which brings the total score to 0. Once you reach 1000 reputation, you become an "established user" which brings the ability to see vote counts. On your question, this looks like:
Next, if you check your own profile page and click on the "Activity" tab and then the "Reputation" tab, you will see an "unupvote"; someone removed their upvote:
So, in summary, one vote was removed but the other two are still there, just not so easily visible.
As for what's wrong with your question, I am afraid only the two people who downvoted can answer that. I don't see any obvious issues myself, and I just upvoted it.