Keyword error: When a keyword was removed from a photo it still appeared in a search using that keyword. Makes keyword pretty useless. I tried several times and exiting from the collection all to no avail.
Lightroom CC does not only use keywords that you can add yourself, it also auto-tags your images using artificial intelligence called Adobe Sensei. I assume that Sensei causes your image to come up in that search. Right now, you cannot 'teach' Sensei anything, but clearly this must change.