So you have two departments and two reports about active clients in B2C Two reports on the same date - Oct 2020. But there are two different KPI in that reports. The cause - one department counts 40 days from last transactions and the other 30 days from last transactions.
ADVANCED Analytics - the most underestimated feature. You can often find a data science squad in an organisation with Qlik Sense but they don't know about that feature or don't know how to implement it.