Ghost post

About 20 minutes ago, I viewed a thread.
After leaving, I noticed that it said that I had posted on it even though I hadn’t.
Does anyone know why this happened?

Shows the same thing on my end, that’s odd.

Sorry for reviving this post, but it happened again on this thread and just figured out why.
I started to write a reply, and accidentally clicked post while it only had a space in it. I then clicked on the back to search arrow at the top left of the page and the same ghost post appeared.
I tested it again in a private conversation, and it didn’t actually increase my post count.

Does anyone have an explanation?