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Nope, that's the way they come. It is/was the norm (so to speak) that each barrel is usually choked differently when shooting, to allow for the "missed shot" that might be further away for the second shot. Or you can choose a barrel with a fuller choke if trying a shot at a further distance.
"...Shouldn't a gun with 2 barrel ship with..." Depends on which model you bought. Most of 'em have fixed chokes. However, you have the set Baikal makes. Different choke for each barrel.
A lot depends on what you're doing with it too. A 20 or 18.5 inch barrel isn't much good for waterfowl, but just dandy for upland birds with the IC and Mod choke.