How to validate import costs report against UI transaction count

Summary:

We've submitted Import costs with Payables as source and transaction status as ALL STATUSES, with BU specified
the import cost output report says that 5784 lines are successfully imported and in Manage Project Screen we are able to see only 1000+ lines.
we've tried to validate this report count against UI transactions with obvious parameters like BU, Transaction source and creation date

Would like to understand how the process has picked 5784 transactions and any other way on how to validate report count against UI count on Project Costs page

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