I think I found the problem with what’s being talked about here: freeCodeCamp Challenge Guide: Target the same element with multiple jQuery Selectors
…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: https://pastebin.com/2C064kCS