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After exporting the data,if you change page and after come back to the same page, the portlet still has the export params in the request (PortletRequest), so the class "TableTag" executes the code for export, but the filter, doesn´t finds those parameters in the HttpRequest so it doesn´t runs the filter.
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In my case the problem was that the links didnt had export parameteres, they where included in the encoded url, so the filter was not finding them.
So my solution was to add those parameters manual modifiying the class "PortletHref" from displaytag-protlet.jar, only for this situation.