Is the tonearm contacting another object at the end of the record? I know, it sounds like a dumb question, but I've made all the dumb mistakes one can make (I think), and that was one of them. The back of the tonearm was contacting the wall of the shelf at the very end of the record!
I also had a problem where the cueing mechanism wasn't level, and contacted the tonearm at the end of a record. That caused skipping.
If it's none of those, then it sounds like you have way too much anti-skate, and the arm is being pulled back to toward the arm-rest.
Does the Marantz have an azimuth adjustment?
Is the table itself level?
Hope this helps.
I also had a problem where the cueing mechanism wasn't level, and contacted the tonearm at the end of a record. That caused skipping.
If it's none of those, then it sounds like you have way too much anti-skate, and the arm is being pulled back to toward the arm-rest.
Does the Marantz have an azimuth adjustment?
Is the table itself level?
Hope this helps.