By default in Administration -> General, the seach limit is set to 1000. I have more than 1000 events and in Monitoring -> Events the last page is empty. There it says "Displaying 1001 to 1001 of 1001+ found". Now change the limit to 10 and see that in Monitoring -> Events, Triggers, Maps and Configuration -> Groups, Templates, Hosts, Actions, Discovery, there are 11 elements shown, not 10. Some pages like screens and maintenance work. All pages should be checked for correct limit and pagination.