Why are my exercise start times not logged

I do aerobics exercises three times a week, starting at 4:30 PM each time. Even though I tell the Fitness Pal app on my Android tablet the start time, it seems to always reset that to 6:00 PM. When Fitness Pal syncs with Fitbit (which logged the exercise properly), the data does not match, of course. How can I force Fitness Pal to log the start time correctly?

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