Since upgrading from Typolight to Contao. We've come across a problem with the events/calendar.

When our client logs into the CMS and navigations to the calendar she can see events 1-12 only.

When we log in from our machines we can see events 1-19, using her same log in credentials, and the same browser (or any other one for that matter)

The client has cleared their browser cache and is still having issues.

Anyone have ideas what could be causing this problem?