Jitter in "Number of dependers" field

As an example -- https://lib.rs/crates/quick-xml/rev

On refreshes the last published version frequently has a jitter when number of dependers changes by 60-80 points back and forth. Sometimes the number is changes on each refresh the page made within seconds. Such significant changes observed only for the last published version, the numbers for other versions changes insignificantly.

So the question: why this number so unstable and and whether it can be trusted?

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