Hey, how can I get Discourse to do X?

I had an issue with the “hide details” collapse function in that post.

Works here. Not there. What am I doing wrong :(
Edit: Seems there is a problem with a stack of “hide details” command being buffered somewhere. It increments each time I try to use it from the drop down menu.
Edit 2: It somehow reset itself by editing this post, and I was able to finally post it as intended. I have tried to reproduce it but it seems the bug is gone.