There might be several possible explanations for what you describe:
- it is possible to configure a router ID for the OSPF process and if a router ID is manually configured it is possible to use any IP address you wish and it does not need to be an address on the router. Is it possible that a router ID was configured at some point (and then perhaps removed some time later)?
- if there is not a configured router ID then the OSPF process will choose an address to use as router ID. It will prefer a loopback address and if no loopback address is available then it will choose an address from another interface. Is it possible that 192.168.101 existed on these devices at some point (even if it was subsequently changed or removed)?
Perhaps you could post the output of show ip interface brief?
If the RID was selected based on an interface that existed before, as a general rule the router continues to use it even if the interface subsequently fails or is deleted, to change this you either need to configure the RID manually or reload the router (clearing the ospf process won't release it). I don't recommend leaving the case as it is now, since this can affect any configuration done using the RID (virtual-links for example) on the next router reload (since the router will take a new RID, since the interface that was used before is not there anymore). Finally i recommend always configuring the OSPF RID manually to prevent any hassles.
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