I am not sure what your question is? Could you please elaborate. I did some testing for you, to be sure. I'll add some screenshots. First I started off with just the capital. This location had one luxury resource (Jade) and this is the only source of Amenity I used through out the testing. I then found another continent (on the same landmass), and founded my second city there. This city benefited from that one Jade in my capital. Later on I got to around the middle of the map (huge map setting), and found a third continent, so now we have both a separate continent on separate landmass and a lot of distance from my other cities. Alas, this city also benefited from that one Jade source. So I am not sure what you did wrong. Did you perhaps already have access to those two luxuries? Have you traded for them from another civilization?