has someone configured a duplicate router ID on one of your routers under the ospf process ? this can cause that alert first thing I would check , check the 2 routers whose ips you have blocked out there and see what there ids are set too
You receive the OSPF-4-FLOOD_WAR error message. The OSPF flood war occurs when the router repeatedly receives its own Link State Advertisement (LSA) and flushes it from the network or sends a new version of it. This is meant to detect issues with Type-2 LSAs when duplicate IP addresses are present in the network, or with Type-5 LSAs when there is a duplicate router ID in different OSPF Areas.