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Sometimes CPU cores are odd
TL;DR: all the assumptions you have about processor design are wrong and if you are unlucky you will never run into problems that users do through sheer chance.
In order to make sure the proof of work challenge screen goes away as fast as possible, the worker code is optimized within an inch of its digital life. This means that each time the proof of work equation is calculated, there is a 50% chance that a valid solution would include a nonce with a decimal portion in it. Showing an encrypted error message on the "invalid response" page so that the user and administrator can work together to fix or report the issue.
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