Who can explain this css counter behaviour?

In the example below I'm displaying two counters:
– one is a total count of ratings
– the other is the current rating

When calculating the current rating I'm using a third counter (DECREMENT) that for some odd reason gets subtracted from the rating counter without being used .

My guess is counters on the same selector are clubbed or I'm not getting the concept (96% chance) – can anyone provide a better explanation?

Thanks :)

Answer by James Holmes (@32bitkid) go read the reply :-)