Why a WU crunched by one person (after the deadline) is not withdrawn from the list of the other person. In other projects it is.
In addition, the other person does not get for crunching points...

For example:
http://srbase.my-firewall.org/sr5/workunit.php?wuid=266600853
____________

The resend was returned after his renewed deadline and in the mean time the original was returned successfully.
When the resend was returned before the deadline and before the original returned, the resend task would have got credit and not the original coming in too late and after the resend.
When the original task would have returned too late, but before the resend and the resend would have returned on time before his deadline, both would have got credit.

Resend task:
Report deadline 5 Nov 2017, 16:40:42 UTC
Received 7 Nov 2017, 2:08:28 UTC

Original task:
Report deadline 31 Oct 2017, 16:37:52 UTC
Received 1 Nov 2017, 1:04:59 UTC