To reach the host 10.10.13.165 the router choose the route OSPF 10.10.13.160/29 (from 10.10.13.160 to 10.10.13.167) because include the destination address. Now Router 3 is the next hop for this route because the network between Router1 and Router3 it's a 10.10.10.4/30 (from 10.10.10.4 to 10.10.10.7 usable ip for host are .5 and .6) therefore Router3 is the next hop that you see in the routing table of Router1 == 10.10.10.5.