This is unfortunately a problem with SE as a whole. The folks that run this site think voting should be anonymous.
However anonymity breeds vandalism and gives cover to those that downvote for other than legitimate reasons. Questions are peer-reviewed, and that's a good thing, but unfortunately we are left with no way to crowd-judge the judges.
The person that thinks your post is wrong may actually be the one that is wrong, but without any explanation we'll never know. All votes should be public, but the SE folks seem adamant about not doing that. Unfortunately we have to live with the consequences.
On a separate topic, I've been tempted to do something about your posts, but haven't. You are asking way more questions than seem legitimate things you actually want to know. It seems you are seeding the site with topics that are of interest to you. We all understand there will be topics here that each of us has no interest in. That's OK when it happens naturally. However, it's a lot more aggravating when it's done artificially. How would you feel if I flooded the site with 5 questions/day about something you have no interest in? People coming new here need to see a mix, not just the narrow topics any one user cares about. Give it a rest already!