Explain the difference between ALL, ALLSELECTED and REMOVEFILTERS.

ALL removes all filters from the specified table or columns, giving a true grand total regardless of user selection.

ALLSELECTED removes the filters coming from the visual itself but respects slicers and page filters — a percent of what the user has currently selected.

REMOVEFILTERS is a clearer synonym for ALL, introduced later with the same behaviour. Choosing ALL where ALLSELECTED was needed is a very common cause of percentages that do not add to 100.