I think your post may have been down-zapped potentially just to obscure the actual target of the downzapping. You can see a pattern happening, especially if you look months ago, into what was downzapped.

Older posts that were downzapped, there was usually a very obvious quality reason - ai content, copy paste posts. And the amounts were much smaller.

Now the pattern is completely different. Except for posts that I believe are decoy downzaps.