A form of this happened to me yesterday evening as well. I started in a queue of ~7800, saw it drop down to about 5500, then saw it jump to 45968. Usually would stay there for like a minute or so, then would drop me back close that 5500 number. Did this several times as I waited. Once or twice, that 45k number stayed for several minutes, but it would always return me to the last 'actual' number I saw.
At a guess, I figure anyone with 'preferential queue status' jumping to the front of the line screws with the queue meter, which shows an 'end of the line' number until it refreshes.
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At a guess, I figure anyone with 'preferential queue status' jumping to the front of the line screws with the queue meter, which shows an 'end of the line' number until it refreshes.