For example, in one level, my highest score was '96,850' and then I got a better score of '98,570'. So that means my score for this particular level should be increased by '1,720' points.

However, when I check my rankings, I found that my total score (for Pig Bang only) was only increased from '1,925,475' to '1,926,145', which is an increase of '670' points.

There are other situations where I got a better score of about '600' points but the total increased only by about '400'. All the scores were taken as snapshots on the new iPad, so I can do calculations with good accuracy. Does anyone know why the scores increase differently?