what cause the isis hostname display a wrong System ID (not loop
I am not sure if loopbacks have anything to do with the SystemID. The SystemID is a part of the net command used inside the "router isis" configuration. If it corresponds to a loopback, it is only because the administrator has manually configured the net command to resemble the loopback's address. There is no automatic conversion of loopback address to SystemID implemented in Cisco's IS-IS implementation.
Would it be possible to post the following?
show isis hostname from a router that displays the allegedly wrong hostname/SystemID combination
The configuration of the IS-IS on the corresponding router with that hostname/SystemID
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