The subcircuit that the macromodel calls has both an IN+ and IN- pin, whereas the MAX9060 only has IN. So the subcircuit needs 5 node assignments, but the MAX9060 only needs 4.
It seems all five nodes were surfaced and then assigned one of them to GND, in addition to the VEE pin which is also assigned to GND:
* MAX9060 MACROMODEL
***************************
.SUBCKT MAX9060 REF GND GND IN OUT
XCOMP REF GND GND IN OUT COMP
.ENDS
***************************
***************************
.SUBCKT COMP 500 18 18 55 56
* 10 = VCC
* 18 = VEE
* 55 = IN+
* 23 = IN-
* 56 = OUT
*****************
As you can see, the subcircuit actually doesn’t surface the IN- pin.