In very simple terms, the who is on line and sharing what 'history' is not something that is updated in real time...
There is a delay in the 'reporting'...
Obviously you have discovered that it does not always pay to linger over your search results list as if it was a mouth-watering menu...
It's more like a short-order diner where you had best get your order in fast !!!
(And, hope the waiter doesn't go home before giving your order to the kitchen !)
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