Amenities from Luxury not working properly?

[Ronin75]

I have 7 cities and 4 differnt luxury resources. Of those 4 I have at least 2 of each. This means I should have at least 4 amenities in each city just from luxury, as each luxury can support 4 cities and I have two of each. This means I could support 8 cities at the very least. But two of my cities are only getting 1 or 2 amenities from luxury and are unhappy?? Why is this not working? Am I missing something?

[Red Dragon]

No idea so I'll ask the obvious questions, just in case: None of the tiles are pillaged and you aren't trading any of them away, right?

[Fxlei]

The second luxuries don't give anything (from the logic point of view I find it strange too), only the first instance of each luxury gives 1 ammenity to 4 cities, the other ones 0 (but from a balance point of view, this seems better).

[Astasia]

Duplicate resources don't do anything, trade them away. It's working as intended.

[Mendeth]

Luxuries don't count twice for amenities. The first is used by cities and then the second, third, etc. are used for trade. Try and trade your extra luxuries for ones you don't have, and/or focus on entertainment districts in the unhappy cities.