Fine, I had someone with more experience check your site and this is what I was advised:

I just saw the post that you mentioned. I'm unsure why that account has started randomly downvoting. I don't have the SP to personally combat their downvotes on posts that do not contain any abuse. I urge anyone who is downvoted by @triplej to visit #steemitabuse and ask for help. There are volunteers that stop in and will help upvote posts that are flagged maliciously.

In other words, go to #steemitabuse and ask them to check why this is happening to your posts. They can find out who is doing it and undo whatever they have done to harm you.

You have already read my previous comments, so I will delete them so that whoever comes here to help you is not upset by my comments.
:)