Why can't I add my "Create a NOR Gate" instructable to a guide that I'm making?

I am able to add my "Easy AM Transmitter" project to the guide I'm working on but not my other instructable, "Create a NOR gate".
Does anyone have any ideas as to why this is happening??

kelseymh6 years ago
Post this as a bug report. If you've already gotten it solved (did you try clearing cache? reloading the page?), update or delete this question.