Meet Me

We have 1 pub and two subs.  All located across Oklahoma. We had a meet me this morning and 95 % of streams when through 1 sub.  They should have went through CM2 locally here but went to CM3 which is not where they should have went. In RTMT, out of 88 streams only 6 went to CM2. The meet me call had a lot of qos issues and I suspect this is part of the issue. Can anyone tell my how its decided which call manager handles the meet me?   The person who initiated the call is registered in CM2.

THanks, John