Did you add this new rule?:
Code:
Combat:ArcheryStationaryPenalty
If so, did you enable the rule and set a value for it?
By default, the value should be set to 1, but if you set it to something like .1, you might see the damage amounts you are experiencing. This would only be for moving or perma-rooted targets though. Have you tried using it on a non-perma-rooted target that is being tanked by someone so it isn't moving around?