If a router has multiple static routes to the same destination with different next hops under the same OSPF process, how does it forward traffic?

When a router has multiple static routes to the same destination with identical administrative distances and metrics (which is the case when they are under the same OSPF process and are all static routes), it performs equal-cost multi-path (ECMP) load balancing. This means traffic is distributed across all available paths to the destination. The router does not consider the age of the route, nor the IP or MAC addresses of the next hops for route selection in this scenario. These factors are irrelevant to ECMP.