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Global RIB convergence when activating OSPF NSF

We have two devices (C4500X) with a similar OSPF-configuration.

After activating NSF in the OSPF-Process we get different outputs on the devices:

 

r1#sh ip ospf nsf
 Routing Process "ospf 1"
 Non-Stop Forwarding enabled
 IETF NSF helper support enabled
 Cisco NSF helper support enabled
  OSPF restart state is NO_RESTART
  Handle 1598491728, Router ID x.x.0.69, checkpoint Router ID 0.0.0.0
  Config wait timer interval 10, timer not running
  Dbase wait timer interval 120, timer not running

 

r3#sh ip ospf nsf
 Routing Process "ospf 1"
 Non-Stop Forwarding enabled
    Global RIB has not converged yet
 IETF NSF helper support enabled
 Cisco NSF helper support enabled
  OSPF restart state is NO_RESTART
  Handle 1552512248, Router ID x.x.0.68, checkpoint Router ID 0.0.0.0
  Config wait timer interval 10, timer not running
  Dbase wait timer interval 120, timer not running

 

I could not find any useful information in the documentation or this community.
What could lead into the RIB not converging and where could we start debugging?
Does this has any impact to the routing/ospf engine?

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