Two specific days, end time not shown correctly

I've successfully created a two-day event in November by using the "exceptions" option. Only one thing I can't figure out yet; the starting time of the event is 10am and the end time is 7pm. For some reason the starting time is shown correct but the end time is set to 6pm instead of 7pm. I already tried to set the end time to 8pm (maybe because of the daylight saving time) but still 6pm was shown. Everything else is shown correct, even the break hours. Any suggestions?