Duplicate emails being received

Oct. 17, 2022
7:09 p.m.
Hi,
I've got a list with ~1600 subscribers (Mailman 2.1.39). It gets one or two messages posted to it each day (by subscribers).
The problem: subscribers are all receiving duplicate copies of the original post and any replies.
All the subscribers are have "nodupes" switched on, and the list is set to replies to go to "This list".
I restarted the qrunner with: bin/mailmanctl -s restart
That seemed to resolve things for a moment but then it started up again.
Does anyone have any tips or pointers?
Cheers.
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Mark Dale