Cartridge fresh out of the box

If this question has been popped previously, my apologies!

Anyways, I just installed a N-I-B Benz Micro MC20E2H cartridge (replacing a vdH MM-1) and I noticed that the sound from one channel (right) is significantly softer than the other.

Could this be due to the cartridge which has (obviously) not being broken-in yet?

Also, when I play a mono LP and set my amp to mono, both channels produce the same level of sound.

Thanks for any feedback.

beck