More than one default gateway

Hi,
sadly mobydick appliance is telling me that more than one default gateway exists.

whilst there is no impact (one physical network interface for internet / SIP trunking and one physical network interface for the local network (phones on additional vlan), the orange message on the top is quite annoying and maybe someone can help me out here.

The interface tun0 is preconfigured by pascom.

root@pascom:/etc/admin# route
    Kernel-IP-Routentabelle
    Ziel            Router          Genmask         Flags Metric Ref    Use Iface
    default         192.168.98.254  0.0.0.0         UG    0      0        0 eth2
    link-local      *               255.255.0.0     U     0      0        0 br0
    192.168.98.0    *               255.255.255.0   U     0      0        0 eth2
    192.168.99.0    *               255.255.255.0   U     0      0        0 vlan90
    192.168.100.0   *               255.255.255.0   U     0      0        0 eth0
    198.19.0.1      198.19.103.X  255.255.255.255 UGH   0      0        0 tun0
    198.19.103.X  *               255.255.255.255 UH    0      0        0 tun0

Thanks in advance
Adrian