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CC2640R2F: CC2640R2F different PER but same PCB

Part Number: CC2640R2F

I have created 2 different software for my CC2640R2DK_5XD PCB.

(both same SDK : simplelink_cc2640r2_sdk_1_40_00_45)

1. host test based software

2. simple peripheral based software

I have retrieved the number of packets from uint8  *pReturnParam; in hci.h for both software to calculate the PER percentage, but the simple peripheral based software has unexpected results.

For the host test based software, I get a PER of 0% on all frequencies @ -60dBm.

This PER is expected since the PER for the host test with no source code modification and only a "Predefined Symbols" change from CC2640R2_LAUNCHXL to CC2640R2DK_5XD in CCS  Version: 8.0.0.00016 had similar readings.

but for the simple peripheral based software, I get a PER of 16% to 27% based on frequency @ -60dBm

What could be the cause of this difference?