Routing problem, or not?

Hi, I'm looking at a network topology but I do not really understand: 192.168.1.0 / 24 Client network - Their default gateway is 192.168.1.1

In the same network there is also a firewall (192.168.1.2) connected to the same vlan. 192.168.1.1 (default gw for clients) has the following routes: 192.168.30.0/24 (web/application network) points at 192.168.1.2 (firewall) 192.168.40.0/24 (another network) points at 192.168.1.2 (firewall) default route points against corporate network (outside the house) They are not using a transport network between server networks and client network?

So clients in 192.168.1.0/24 will send all traffic to 192.168.1.1 but when they are trying to reach internal web/application servers they will first send their traffic to: 192.168.1.1 and that router sends the traffic to 192.168.1.2. In my head the return traffic will go from interface 192.168.1.2 directly to the clients? should not this be a problem? There are no portforwarding or nat rules. It does work, but not in my head(?)

Thanks for input!