If double-flagging is causing a problem, then it seems like a bug in one or both of the modules. They should probably just not evaluate posts that are already flagged (and then maybe check again before trying to set a flag)
If double-flagging is causing a problem, then it seems like a bug in one or both of the modules. They should probably just not evaluate posts that are already flagged (and then maybe check again before trying to set a flag)