The way the Bowling Rankings page is calculated has changed a little.
Previously, the bowlers were ranked on a combination of bowling average, economy rate and strike rate.
After doing some more maths, it turns out that the economy rate (runs per balls) is already covered by the batting average (runs per wicket) and the strike rate (balls per wicket). Consequently, I have removed the economy rate from the calculation.
Bowlers are now ranked based on bowling average (how many runs are conceded per wicket) and their strike rate (how many balls per wicket) to provide a good balance between runs efficiency and speed of getting a wicket.
You can see the Bowling Rankings via the "Players" drop-down on your public web site or by running the Bowling Rankings report from the admin panel reports function.