Natural Selection. A thread that can take off from the original post is a thread that doesn't need a 'bump'.
Any thread that needs a bump after "Post #1" is clearly being naturally de-selected by the community. It isn't really a swipe at you, as much as the thread.
To answer your question, I think it is a glitch that has been ongoing. Things like this also happened to starting HBs. Often at the end of a game where you are dominating. (At least in my case)