Openvpn is blocking wan internet access

I have multiple openvpn tunnel, tun0, tun1, tun3, once the tunnels are up the wan lost internet connection and wan is serving the LAN, LAN can't access the internet.

Tunnel tun0, tun1, tun3 is serving VLAN10, VLAN20, VLAN30

Please help. how can i solve this. Thank you

For interested readers some background:

I dont want to use pbr. it is not working as expected. i want the LAN to have access to wan internet connection alone. while vlans account tuns without interrupting the LAN