Well, it was a quick fix to remove that "improvement".. Just edit this file, seach for "extraTemp", remove the yellow-marked "-1", save and restart Weewx..
/usr/share/weewx/weewx/drivers/wmr200.py elif sensor_id >= 2: # Extra temperature sensors. # If additional temperature sensors exist (channel>=2), then # use observation types 'extraTemp1', 'extraTemp2', etc. record['extraTemp%d' % (sensor_id)-1] = temp record['extraHumid%d' % (sensor_id)-1] = humidity if DEBUG_PACKETS_TEMP: -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to weewx-user+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.