Why my VPN client has other IP than the VPN Server?

I configure the pivpn on my raspb.
I configured in server.conf the macro push server 10.10.0.0 255.255.255.0 and when I run the command on my raspb I have this :

Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
0.0.0.0         192.168.178.1   0.0.0.0         UG        0 0          0 eth0
10.10.1.0       0.0.0.0         255.255.255.0   U         0 0          0 tun0

and when I run the same on my client I have this results

Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
0.0.0.0         192.168.178.1   0.0.0.0         UG        0 0          0 wlp0s20f3
10.186.229.0    0.0.0.0         255.255.255.0   U         0 0          0 tun0
73.36.145.116     192.168.178.1   255.255.255.255 UGH       0 0          0 wlp0s20f3
192.168.178.0   0.0.0.0         255.255.255.0   U         0 0          0 wlp0s20f3

and I cannot understand why tun0 has not the same IP range as the VPN server is configured.