On selection of 'monthly' filter, the month names get repeated twice. What could be the reason?

On selection of 'monthly' filter, the month names get repeated twice. What could be the reason?

Verify DIM_DATE table for the following case: ----------------------------------------------------------------- In "DIM_DATE" table, the "month_in_year" column might be different for different years. Ensure that "month_in_year" column in "DIM_DATE" is unique for a given month.