OpenVPN problems

Hi there,
my Router(Fritz!Box) is connected to the internet. A RaspberryPi3 (OpenWRT) is connected to this router by ethernet line. My goal is to have an wifi access point (openWRT) where all communication to the internet goes through a VPN tunnel. I use "golden frog" VPN Provider.

I followed the user guide " OpenVPN client using LuCI" with no success.
Well, I think my VPN connection to OpenWRT is working. I get two different IPs when I'm connected (Wifi) to OpenWRT:

SSH on OpenWrt side:

root@OpenWrt:~# curl api.ipify.org
128.90.43.XX

My laptop, connected to OpenWrt:

chris@chris:~$ curl api.ipify.org
178.24.159.XX

I have no idea which infos are usefull for you guys to help me, but here's the output of "ip route":

root@OpenWrt:~# ip route
0.0.0.0/1 via 10.2.1.1 dev tun0 
default via 192.168.178.1 dev br-lan  src 192.168.178.100 
10.2.1.0/24 dev tun0 scope link  src 10.2.1.219 
128.0.0.0/1 via 10.2.1.1 dev tun0 
128.90.34.33 via 192.168.178.1 dev br-lan 
192.168.178.0/24 dev br-lan scope link  src 192.168.178.100 

My Fritz!Box has 192.178.1.1
OpenWrt has 192.178.1.100, (by DHCP from Fritz!Box)

Any advice?

Kind regards
Chris

It Looks like you have setup your Pi as a Bridged AP?

Traffic from your connected clients then just bypass your Pi.

You have to setup a Guest Wifi on this bridged AP, clients connected to this bridged AP will go through the VPN