Dhcp ok but not internet

Hi, i've 2 wan in load balancing and 3 lan with 3 dhcp server. Mi configuration is this:

wan1: 192.168.199.105/24 gw: 192.168.199.1 (static ip from router 1)
wan2: 192.168.200.2/24 gw: 192.168.200.1 (static ip from router 2)
wan1 and wan2 load balancing

lan1: 192.168.21.1 dhcp server (for office 1)
lan2: 192.168.31.1 dhcp server (for office 2)
lan3: 192.168.41.1 dhcp server (for office 3)

Problem is: dhcp works ok. PC receive ip, gw and dns. But cannot go to internet. How can i check what's wrong? Do you need sone log for help?

Thanks