I think I found the problem with what’s being talked about here: freeCodeCamp Challenge Guide: Target the Same Element with Multiple jQuery Selectors - #8 by Avaloncat
..and it is an obscure hard to notice nuance of the code that is not mentioned in that thread. However, the topic is locked so no way to add a comment about it.
I do feel it would be a valuable contribution to that topic though (since it is something that would be very hard to spot and it also teaches something about a funny nuance of jquery I think).
Is there anyone to talk to to see if they want to add the information there?
I pasted the my discovery here for now: freeCodeCamp Challenge Guide: Target the same element with - Pastebin.com