Why some GNSS fixes of a track are missing under Month and Year mode?
When you generate the track for a day, data center displays all of the GNSS fixes of the track. However, when you generate the track for a month or a year, data center only displays the last successful GNSS fix of each day in the month or the year. So the maximum number of GNSS fixes on display is 365 for Year mode and 31 for Month mode.
Note: If you need to see all GNSS fixes of a device in a map, you can export the data to KML format and open it with Google Earth.