Hi there, Andres! Thanks for reaching out and splitting your questions into separate threads–we really appreciate that. 🙂
It appears the same sort of conflict that is causing the issue in the other thread is also at play here as well. In this specific case, I see that there have been some customizations made to the calendar (they may have been packaged that way with the theme) that could have an impact on the functionality. For example, when I view the page source, there is a jQuery function called fixingEventCalendarWidget() that appears was added to the page template as part of a customization.
Unfortunately, we’re unable to support custom development like this here in the forums, so I would suggest contacting the developer that made them to help troubleshoot and fix the conflict that the added code is causing.
Sorry again for not having a solid solution for you, but I hope this at least points you in the right direction.
Thanks!
Geoff