"Norm - as to point 3 ... when they add the port charges at this point, do they add the port charges for one or two people?"
There's one more addition after step 3 that I did not mention it separately because it's applicable to all fares regardless of occpancy. After completion of step 3 from my earlier post, you have to add "government taxes and fees." Note that "port charges" and "government taxes and fees" are two separate items. Published fares ordinarily include "port charges" but do not include "government taxes and fees." Quoted fares, OTOH, usually include both.
Anyway, could the "government taxes and fees" be the second addition on your quote? Perhaps your travel agenet is confused?