That "Others" happens when the sum of values is less that some value. That value may be set in the same object, usually in the Presentation tab of the object properties, "Lower Limit on Slice Area". That means that all values of dimension for which expression is below 2% will be aggregated as "Others" instead of appearing a lot of very small values in the same chart.
Depending on the selections you do and the values you click, this value will change.
Hope that helps.