We currently only have one DKP system available to select.
And as far as when this started we just noticed it in the last raid becuase we were alerted by a guild member that checked the dkp totals before the raid and noticed his compitition for loot dkp was not going down during raid while he won items. How long this has been happening before that I am not sure.
We have another raid tonight and will see if it is duplicated. Though having 2 ppl running the mod having the same result does seem to show some sort of bug.