If the diagram is a single OSPF area, and that area isn't Area 0, my question would be where are the HELLO packets flowing? That would answer the question. That would determine how the LSDB is being managed. Single Area OSPF has these characteristics: 1) All routers must do algorithm, 2) Many LSAs are processed on every router, 3) Large routing tables. Looks like you have about 5-6 different routes to advertise and that may be keeping your routing table small. But if those networks have multiple sub-networks, then......IDK.....
Lenell D. White III
Cornerstone IT & Communications, LLC
1415 Hwy 85 n
Fayetteville, GA 30214