double Tx/Rx Hw. frame stats

Hi,
I’m testing my 5GHz interface by generating traffic between laptop connected via wifi and PC connected via Gbit ethernet on the same routerboard.
Noticed the hardware frames and bytes are approx. double the count of transmitted frames & bytes. Is this normal and if not — what could be the problem?

The wireless interface is virtual , ap-bridge mode. The master wireless interface is station-bridge to another hotspot.

stats of the registration of the laptop:

Tx Rate 877.5Mbps-80MHz/3S
Rx Rate 877.5Mbps-80MHz/3S
Tx/Rx Packets 721 734/4 175 988
Tx/Rx Bytes 96.0 MiB/5.8 GiB
Tx/Rx Frames 103 743/2 122 393
Tx/Rx Frame Bytes 103.1 MiB/5.8 GiB
Tx/Rx Hw. Frames 164 683/2 128 059
Tx/Rx Hw. Frame Bytes 251.5 MiB/5.9 GiB