If you create a filter using an specific field (status, for example), and then use the portlets Statistics or TwoDimensionalStatistic to show this filter using the same field you chose to create filter, the information the portlet shows is right, but when you click in one of the links (any status, in the example), it will show you not only that state, but all of them.

I've looked for this bug in jira.atlassian.com and I've found someones similar, but not this.

Regards,

Andrés.