Recently We found out that When we do any SAINT upload and if Key value is not captured in the month that you are uploading, it will be contributed to unique values.
so for example if you are Classifying any variable that has 500K limit for the month and if you have 1MM unique key that you want to initially classify then for every Key that is not captured in current month it will increase Unique value count and will easily pass 500K limit.