Agent installed but showing as not installed

Agent installed but showing as not installed

We do a discovery scan daily at noon and sometimes after the daily scan has performed it shows 640 computers with no agent.

And if I do a manual scan of these 640 computers that number drops down to 60. Is there a reason why sometimes the discovery scan would not be able to detect the agent but the manual scan done immediately after would?

This is more of an annoyance than a serious issue but it is still annoying.

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