In B1UP versions prior to version 2017.04 the columns "Due 9-30" / "Due 31+" was switched for the "Customer Receivables Ageing" report that are part of the "Financial overview" dashboard. This leads to an incorrect overview compared to the SAP ageing report.
This was fixed for new databases in B1UP 2017.04.
For old databases you will need to import the attached dashboard using the dashboard editor and then use the updated dashboard.