bad link to event in the month view

Hi, 
Normally, in the month view of one of my websites, I can access to an event by a link like "index.php/calendar/name-of-the-event".
On another website the link is "index.php/test/name-category-of-the-event/name-of-the-event"
This link is not working.
I don't know if it's a bug or an incompatibility with this template :  www.joomlart.com/joomla/templates/ja-agrivita
Thanks!
 

Hi Gilles

The template might have override for Events Booking layout and it causes the issue. Could you please check the template, if there is override for Events Booking, please remove it, then check it again to see if it solves the issue ?

Regards,

Tuan