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Openstack external network subnet issue

We have multinode openstack deployed in production. We have tenant networks (openvswitch) and an external network with multiple PUBLIC subnets in it. One of the subnets has issues. We launch a VM, associate a public IP from that subnet. VM can reach internet, internet can reach VM. The problem is that VM can't reach any of the IP's in the public subnets in our external network, and vice versa. It can reach everything outside our subnets, and everything from outside can reach the VM. Anyone have any idea what is the issue with this subnet? We use distributed routers for each project that uses external network and it's public IP's. Openstack version is Liberty.