I am a 74-yr old newbie with utterly no exp w model railroading or any similar craft/hobby. I recently purchased a new n scale Kato EMD diesel and two new, different sets of Kato freight cars. The couplers on all of the cars, regardless of set, are appreciably, visibly lower than the coupler on the loco. Indeed, they are so much lower that they slide almost completely UNDER the loco coupler. This can’t be correct (can it?). Any advice on what the problem is or what to do about (I’ve an micro-trains n scale coupler height gauge on order but will be a week or more before I receive)? Much thanks in advance.