I don't believe that your posts are actually making the thread negative. I had the same exact thing hapen to me, however when I requested more information from the sender they told me

It didnt have an effect, i was just surprised that so many people negged me.
At least in my situation my AP's didn't have any effect. Because I still have newbie status might be one of the most reasonable explainations. Also check your antipoint center, it shows the ones that you've given out. If the box's that you assingned have the color grey than the most likely had zero effect on the post.

Hope this helps...
--Peace