This is the SQL behind that report; and I have tested in 2 environments today with success showing both Node Added and Node Removed events.
select netobjecttype ,netobjectid ,eventtime as 'EVENT TIME' ,case when convert(varchar(10), eventtype) = 8 then 'Node Removed' when convert(varchar(10), eventtype) = 9 then 'Node Added' end as 'EVENT TYPE' ,n.caption as 'DEVICE' ,MESSAGE
from events
join nodes n on n.nodeid = netobjectid
--THIS LINE LIMITS REPORTED EVENTS TO 8(NODE REMOVED) AND 9(NODE ADDED)
where eventtype in ('8','9')
--THIS LINE LIMITS REPORTED EVENTS TO THE LAST 7 DAYS
and eventtime > (getdate()-7)
order by eventtime ASC