Infrastructure Master
Operations Masters

The infrastructure master must not be setup on a global catalog master.
If you have 2 domaincontrollers that are also global catalog servers and you are setting up a thirth domain controller that is not a global catalogserver then it will know that, and will move the infrastructure master to this new domain controller.

Why is it that the infrastructure master should not be on a global catalogue server is as follows:
When there is a name update in a domain from another domain it will change that name but since the global catalog and the infrastructure master are on the same machine it sees no update and will not replicate that change to another domain controller.
So the other domain controller has for the same SID and they are different names so that's inconsistently
Operations Masters

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