More than one faction on a spot seems to be a by-product of the bug that 'incapacitates' fleets on a trade spot. The fleets cannot be moved (only destroyed) and they do not trade. Once this happened to me and I forgot about the fleet for a turn. The next turn: a Dutch fleet was sitting on the same spot (while my fleet was still there) and trading away...
Being unable to attack pirate fleets seems a by-product of the same issue...
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