Couple of 9408 phones show wrong time, No time drift on NTP not CM. I could find a error log message in the every phone stating that System clock change.
Make sure you check out their Network regions and their location assigned is not off-set to timezone. Just a valid check
I would also check the Firmware version release notes to see if any of those issues reported.
If everything is working fine, then you might want to run a sniffer between a working phone and non-working phone and compare the traces to see what is going wrong.
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