How to prevent pfsense from pushing a random route to the client

I've setup an OpenVPN server which uses tap device mode and everything works allright if I accept to work with dynamically assigned IP addresses.

When I want to assign static addresses to the clients, I put

ifconfig-push 192.168.5.4 192.168.5.1

in the Advanced Settings section of Client Specific Overrides entry of clients.

As a result, the client would be assigned with the ip of 192.168.5.4 but there is the following entry in the route table:

192.0.0.0   255.0.0.0 ......... tap0

...which ruins all settings of the vpn. If I add push "route 192.168.5.0 255.255.255.0" then there is a meaningful entry itself in the route table, but since the weird one still exists, it does not have any meaning at all.

Why is there such a route entry being inserted to the route table?

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