This view anomaly occurs because the default is a zone west of the secondary and Outlook takes into consideration that DST goes into effect in the earlier time zone and adjusts the times using the wrong offset. The entire 24 hour period uses the same offset and the first day in the view determines the offset. This issue also affects the view when the time 'falls back' to standard time, but only if the dual time zones are 3 or more hours apart.

Fortunately Outlook uses GMT and time zone offsets to calculate appointment times and reminders are based off the default time zone, not the secondary zone, so it's unlikely to cause missed appointments. When you open the appointments they appear at the correct time.

"Time heals all wounds" and it will fix this display problem - until then, use the work week view if you use the dual time zone feature and the default zone is west of the secondary zone.

DST Starts or Ends on different dates

When the two time zones start and/or end Daylight Saving time on different dates, the time scale will vary during the delta period. For example, Helsinki starts DST at the end of March while the US makes the change 2 weeks earlier, so during this 2 week period, the usual difference will be off by an hour, depending on which zone is set as primary. In the fall, there is a 1 week lag where the times will be off by an hour.