Perhaps you are looking at 2 different places. "Elliptical" is probably the workout log under the days of exercise tile; whereas Moderate and Intense show from tapping on Zone Minutes.
Zone Minutes is concerned with the intensity levels determining how many zone minutes you are credited (double for higher intensity). The workout log is looking at the workout as a whole.
If you look under 'days of exercise' I expect you will see the usual Elliptical log as well.
Before posting, re-read to see if it would make sense to someone else not looking at your Fitbit or phone.
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