hmm, it seems the only way to fix is to change it so that a city can have 5 national wonders or maybe change the alters to only 4 instead of 5.
or can the alters be made into rituals and anyone/civ can build/do 5 of them ? the ritual's of sheim/elohim for raising/lowering the AC can be done multiple times.
i was thinking to make alters into world wonders, but this wouldn't work as ONLY 1 can be built. civ "A" builds alter 1. civ "B" builds alter 2. civ "A" can't build alter 2. civ "B" can't build alter 1.
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wow!!!! i jsut thought of the answer!!!!
have the first 1-4 alters as national wonders as they are. make the fifth and final alter as a WORLD WONDER. problem solved!!!