Global Administrative CA Performance Management user sees all Collections and Tenants when proxying a Tenant for a single customer.
The Collections and Tenants should only reveal those for the specific customer whose Tenant is being proxy'd.
CA Performance Management r3.5
During Tenant creation the Tenant is synchronized to the Data Aggregator.
During this process the correct relationships are established between the Tenant and the Collections that belong to it.
If there is a problem during this cycle CA Performance Center defaults to providing the relationships present for the Global Tenant, which results in all Collections for all customers being displayed.
Delete and recreate the tenant.