Referesh time and strage output

hello all,

I shutdown two server today. The servers are completely shutdown but nagios still showing all the services running with green. when it finally refreshed it actually disappear from the list. This is certainly not normal. This must be something to do with refreshing the webbroswer etc. It would not be nice when system is re-starting and nagios is showing its up. how can i modify those setting.

M