Report grouping

I am in the process of constructing a report that aggregates payments by Check ID, subsequently displaying all associated payments for each specific check. The report incorporates header groupings first by Check ID, and then by Supplier Reference Number. However, it does not display all detailed transactions under the same Check ID. Instead, it presents two transactions, then proceeds to the next check, and repeats this pattern. Would anyone have insights as to why, when employing the ‘group by Check ID’ function, the report does not exhibit all payments linked to a particular Check ID, but rather distributes them across multiple pages?

Would you mind booking time on my calendar to sync up on this? I’d like to see exactly what’s going on.