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?