You are probably seeing your trade theater income in Bristol. All goods are shipped to your capital, then distributed to your trade partners.
Also, John is incorrect. Any trade port that is connected to your capital can trade. For GB, this includes both Scotland and Ireland. The Irish trade route is bugged though, it doesn't show up on the campaign map.
To verify, note that you can make a total of 9 trade agreements on the first turn - you have one level 2 port in England which gives 3 routes, and one level 1 port in England, Scotland and Ireland, giving you an additional 6.
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