Insufficient Slave and Over Surplus Production

[finmise]

Province has got 2 cities which produce cloth and (4) slaves produce (2) cloth in Rome. (18) slave pop makes surplus by default.
Is this current situation normal?

 

[vitek69]

Cities produce 2 trade goods by default afaik, Settlements produce 1 and Metropolis produce 3, irrespective of the number of slaves.
Slaves give an extra trade good above the base production

 

[finmise]

Cities produce 2 trade goods by default afaik, Settlements produce 1 and Metropolis produce 3, irrespective of the number of slaves.
Slaves give an extra trade good above the base production

I haven't noticed that before on wiki. Thanks.