For some custom events majority of the data is “Others”. What is “Others” and why are we getting the data?
Unity Editor- 2019.7.3f
When showing categorizable Parameter values, only the ten most common values are broken out into individual groups. It is recommended to consider this when designing the parameters of the event.
https://docs.unity3d.com/Manual/UnityAnalyticsDataExplorer.html
If you want to see all Parameter values, you can export the raw data, it requires a Pro license.