[time-nuts] Lady Heather clock question

[B Riches]

How can a make my LH V6.1 clock show time equal to UTC time?  It is 18 seconds fast = to 18 second offset.
Set up:
Windoze 10
simple con fig file = /3  /rx  /tz=-4edst
KS24361 - REF0 GPS
UTC time in greenDate, Week, TOW in yellowDate 28 Jul 2021  ro Week 2160UTC ofs:18 in white
When programming is running and I enter rxx/17 clock = UTC time but receiver has shut down.
What am I doing wrong?
Thanks for any help.
73,
Bill, WA2DVUCape May, NJ