Getting Birthplace of Global Trade makes my trade income fall

[Krawler]

Playing as Genoa in 1.22.2 patch I get the Birthplace of Global Trade, Institution. Nice!
I get Global Trade Hub modifier in Genoa for a 10+ Local Trade Power.

Great, but then...my trade income immediately drops from 14.14 to 10.78, (auto)-collecting in Genoa home node only, so a 25% drop in trade income. Which kind of hurts

I don´t get this, it must be perfectly reasonably, but I would like to understand the mechanics at work here. Can someone please explain what happened.

Did my local trade vanish into the global trade due to this institution or what?

 

[Sauron44]

just coincidence, the reason for the drop is something else.

 

[vfmikey]

Maybe some war just ended and someone send their navy back to protecting or something like that.

 

[deathbypie]

So many things could have affected it. Either some modifier expiring at the same time, or other countries changing their trade power. Maybe your bourgeois influence or loyalty just went past a certain threshold.