wireguard strange problem. 7.10 os

Hi, i have upgrade to 7.10 , 2 hap ax2.

I use them for wireguars site to site vpn with a script to update the endpoint address(dynamic ip at isp routers)

i have notime a strange problem.

From site 2, i use bandwith test, to test the connection between the router. The wireguard tunnel uses 192.168.80.0/24 range.

Look at the picture the bandwith!!! site 1, has 192.168.80.1 and site 2 uses 192.168.80.2.

The bandwith from isp’s are 50mbps down/5 up

HOW can this happen?

If i let thebandwith tool running, the cpu hits 100%.
IF i use the internal ip (192.168.1.1/24 of site 1 the bandwith is the ‘‘correct’’)
gbps.png