Unfortunately, email notifications are currently intermittent at best.
I note that your profile had "Notify me upon replies by default" set to "No"; I've changed that to "Yes" but I doubt there will be any permanent change.
Sometimes, unsubscribing/resubscribing works but it never seems to last.
The site owner has been informed but I have no idea when it might be fixed.
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Giraffe: a ruminant with a view.