It could be because your top 60 hardware slots where already filled before you started subbing your 1060 results.
Therefore only 1060 results that scored more hardware points will make it into your top 60 and they'll supplant a slot currently occupied.
So for example let's say you scored 21hardware points for a run on your 1060 and in your 60th place slot was a score that got 20 hardware points your new 21points run will replace it. However it'll only add 1 point to your overall total because its only 1 point more than the score it replaced
Hope that helps give you a better idea of what's going on.
Once you have all 60 hardware points slots filled it becomes harder to add to your overall total, so you need to become more picky about what cards, cpus you bench or improve your cooling so you can run faster score higher and gain more points
Same basically goes for Global points too