I notice the scores are getting refresh or update after you fought a match. I have 3 nodes line up for about 50+ points each, after winning first match, both score drop to 46, another win the last one drop to 39. Is it new or something I overlook in the past ?
This thread is a pretty good explanation of how things function with PVP scoring. It may not answer all your questions directly, but it is very informative -