The nummeric value does not match the combination of the time stamp in the header and your fysical location which is not the Zulu time zone. The value should be -0700 as in the messages from your Z1 AKA.
МК>> It is frowned upon but is entirely acceptable as per ISO standards.
It is not in complience with FTS-4008.002 and it is Fidonet standards that apply here.