There are multiple machines for manager quorum, and there are extra containers (more than the number of instances deployed).
When deploying a partitioned Space, the instances should be deployed so that all machines contain at least one instance, and the primaries are distributed across the machines.
Tthe instances get deployed unevenly. For example:
Machine with no instances
All primaries on one machine
Configure the XAP Manager to use the WeightedSelector.
Use WeightedSelector instead