Looking at a VM object in the Inventory under the traversal spec "Integrations" (See image), it may show 2 or more related vCenters.
Aria Operation 8.18.X
Multiple vCenters in the "Integrations" traversal spec simply means that this object has a relationship to both vCenters.
A common cause for this is that the VM was vMotioned between these vCenters.
The relationship tree can be complex with cross-VC relationships created by network-related adapters. For example: If an NSX switch has a relationship between vCenter "A" and "B".
NOTE: Multiple vCenters in the "Integrations" traversal spec for the object does not mean the the object is being monitored by duplicate vCenter adapters.
This is expected behavior.
Look at a VM object in the Inventory under the traversal spec "vSphere Hosts and Cluster" instead (See image below)
This traversal spec will only display the vCenter which is currently monitoring the object.