Are you just seeing this issue?
Or to summarize: with live logs, after a page refresh, you could see the current device "display name" (label if you have one, name if you don't). If the logs have been opened since the device was joined, you'll see that until a refresh. In past logs, however, I believe the oldest display name will still be in use until those entries are cleared. If that's where you're looking--and it appearance you are from the screenshot--it would explain why and will eventually show the newer name.
