Under the microscope: Traders and Gunboats

I have found what I think might be an error in the Light Scout; it lists the Survey Sensors as 12 tons and Mcr 10; the sensors also have Enhanced Signal Processing, but it lists the additional tonnage and cost separatley. This appears to be the only Survey Sensors in the book that do not match the ones in High Guard. Now, this ship is a TL 13 design...but I don't know if there are rules for modifying that.

Is this in fact a mistake? or am I missing something?