I have an Issue Statistics gadget on my dashboard. Its based on a simple filter showing all open tickets for 3 helpdesk techs. Then the gadget shows the total number of open tickets for each tech. The problem is that if you count their tickets in the filter, the real count is occasionally correct, but usually is higher than what the gadget shows. The amount that it is off by seems to vary as well (As few as 1 and as many as 7).