Email notification double url format

[Hurdet]

When I receive new post notification in email, the url link sometimes are in format

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https://www.ghisler.ch/board/viewtopic.php?...

and other in format

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https://ghisler.ch/board/viewtopic.php?...

This create problem with cookie and session.
Do it is possible to every get same domain?

[ghisler(Author)]

To my knowledge the URL depends on what the poster uses to browse the forum - if they go to www.ghisler.ch the notifiation uses that, and instead if they go to ghisler.ch the notification will use the shorter URL.