Issue with WHT Deduction at time of payment processing

We have configured WHT codes at time of payment processing. Code F5 (10%) is defined in system and assigned to vendor master data.

1. We processed payments for 29 vendors and tax was deducted correctly.

2. Payment document was cancelled/reversed and invoices were reversed. WHT also reversed completely.

3. New invoices were posted and liability created with same WHT Code (F5.

4. At time of payment, only for 23 vendors, WHT is deducted correctly while for rest 6 vendors system is not calculating WHT.

We have threshold defined in system and accumulation check is activated for WHT.

Same scenario is working fine and as per standard in DEV and QAS server, but not in PRD.

Any possible reasons?