Yeah, it is.
One of the posts this happened to was a post for a charity project I run (called Mission: Agua-Possible). I always give 100% of the post payout to the project, right down to the decimal point. Having a 3rd party come in and take part of that payout, which was earmarked to bring water back to thirsty victims of the crisis in Venezuela, is upsetting. I've been careful for nearly a full year, to make sure every satoshi from each post ends up going to the project. Now, somebody's pocketing some of those funds, and I don't seem to have any control over it. Makes me feel uneasy.