Talking about reports (Dashboard > Reports > Automations)

A client wants the information:

"% of emails opened in April"

When I change the date in the report, this part doesn't change. In fact, when we change the calendar, some data doesn't change. It could modify because it shows data clusters by period. This helps clients in their reporting. And usually, they report at the end of the month or related to past period. If they can't see the piles from the previous month, that's bad.