Two DHCP servers on same LAN - can't ping clients

Hi!

Router 1 has IP 192.168.1.1 and DHCP range from 192.168.1.2-49 and router2 has IP 192.168.1.50 and DHCP range from 192.168.1.51-100. Router2 is connected to router1 from WAN port and gets it WAN IP address from router1 trough DHCP.

Why can't clients that are connected to router1 see clients that are connected to router2 even though they are on the same subnet?

Thanks!