"-5" doesn't mean a thing. Name the gross score! It's one of several 31s, doubling to 62 for average calculation.
So you shot above your average and wonder why it didn't drop like hell? Revisit your high school math teacher for advice! ;)
In earnest, you appear to have a saturated average (more than 50 TM scores) which may drop on higher scores. Unfortunately, your score history has been erased when you were inactive - no detailled information available.
Don't worry, just play on: At 61.00, you will be promoted!