[SOLVED] Pentaho Report Designer error: Assert: Shift is not as expected

I'm building a report which is basically a big set of pie charts (13 of them) grouped by user.

Each pie chart uses a diferent query (actually, same query, different table). I laid them down, and everything was fine until pie number 11. Pie number eleven crashed PRD with the error:

org.pentaho.reporting.engine.classic.core.InvalidReportStateException: Assert: Shift is not as expected: realY=252100000 != expectation=251700000; Shift=63200000; AdditionalShift=-400000; RealShift=62800000

I checked the query and it is ok.

Anyone can explain what is happening, or give me a hint about what is failing?

Full stacktrace:

org.pentaho.reporting.engine.classic.core.InvalidReportStateException: Assert: Shift is not as expected: realY=252100000 != expectation=251700000; Shift=63200000; AdditionalShift=-400000; RealShift=62800000 at org.pentaho.reporting.engine.classic.core.layout.process.PaginationStepLib.assertBlockPosition(PaginationStepLib.java:162) at org.pentaho.reporting.engine.classic.core.layout.process.PaginationStep.handleStartBlockLevelBox(PaginationStep.java:169) at org.pentaho.reporting.engine.classic.core.layout.process.PaginationStep.startBlockLevelBox(PaginationStep.java:159) at org.pentaho.reporting.engine.classic.core.layout.process.IterateVisualProcessStep.processBlockLevelChild(IterateVisualProcessStep.java:421) at org.pentaho.reporting.engine.classic.core.layout.process.IterateVisualProcessStep.startProcessing(IterateVisualProcessStep.java:51) at org.pentaho.reporting.engine.classic.core.layout.process.IterateVisualProcessStep.processBoxChilds(IterateVisualProcessStep.java:440) at org.pentaho.reporting.engine.classic.core.layout.process.IterateVisualProcessStep.processBlockLevelChild(IterateVisualProcessStep.java:423) at org.pentaho.reporting.engine.classic.core.layout.process.IterateVisualProcessStep.startProcessing(IterateVisualProcessStep.java:51) at org.pentaho.reporting.engine.classic.core.layout.process.IterateVisualProcessStep.processBoxChilds(IterateVisualProcessStep.java:440) at org.pentaho.reporting.engine.classic.core.layout.process.IterateVisualProcessStep.processBlockLevelChild(IterateVisualProcessStep.java:423) at org.pentaho.reporting.engine.classic.core.layout.process.IterateVisualProcessStep.startProcessing(IterateVisualProcessStep.java:51) at org.pentaho.reporting.engine.classic.core.layout.process.IterateVisualProcessStep.processBoxChilds(IterateVisualProcessStep.java:440) at org.pentaho.reporting.engine.classic.core.layout.process.IterateVisualProcessStep.processCanvasLevelChild(IterateVisualProcessStep.java:370) at org.pentaho.reporting.engine.classic.core.layout.process.IterateVisualProcessStep.startProcessing(IterateVisualProcessStep.java:55) at org.pentaho.reporting.engine.classic.core.layout.process.IterateVisualProcessStep.processBoxChilds(IterateVisualProcessStep.java:440) at org.pentaho.reporting.engine.classic.core.layout.process.IterateVisualProcessStep.processBlockLevelChild(IterateVisualProcessStep.java:423) at org.pentaho.reporting.engine.classic.core.layout.process.IterateVisualProcessStep.startProcessing(IterateVisualProcessStep.java:51) at org.pentaho.reporting.engine.classic.core.layout.process.IterateVisualProcessStep.processBoxChilds(IterateVisualProcessStep.java:440) at org.pentaho.reporting.engine.classic.core.layout.process.IterateVisualProcessStep.processBlockLevelChild(IterateVisualProcessStep.java:423) at org.pentaho.reporting.engine.classic.core.layout.process.IterateVisualProcessStep.startProcessing(IterateVisualProcessStep.java:51) at org.pentaho.reporting.engine.classic.core.layout.process.IterateVisualProcessStep.processBoxChilds(IterateVisualProcessStep.java:440) at org.pentaho.reporting.engine.classic.core.layout.process.IterateVisualProcessStep.processBlockLevelChild(IterateVisualProcessStep.java:423) at org.pentaho.reporting.engine.classic.core.layout.process.IterateVisualProcessStep.startProcessing(IterateVisualProcessStep.java:51) at org.pentaho.reporting.engine.classic.core.layout.process.IterateVisualProcessStep.processBoxChilds(IterateVisualProcessStep.java:440) at org.pentaho.reporting.engine.classic.core.layout.process.IterateVisualProcessStep.processBlockLevelChild(IterateVisualProcessStep.java:423) at org.pentaho.reporting.engine.classic.core.layout.process.IterateVisualProcessStep.startProcessing(IterateVisualProcessStep.java:51) at org.pentaho.reporting.engine.classic.core.layout.process.IterateVisualProcessStep.processBoxChilds(IterateVisualProcessStep.java:440) at org.pentaho.reporting.engine.classic.core.layout.process.IterateVisualProcessStep.processBlockLevelChild(IterateVisualProcessStep.java:423) at org.pentaho.reporting.engine.classic.core.layout.process.IterateVisualProcessStep.startProcessing(IterateVisualProcessStep.java:51) at org.pentaho.reporting.engine.classic.core.layout.process.IterateVisualProcessStep.processBoxChilds(IterateVisualProcessStep.java:440) at org.pentaho.reporting.engine.classic.core.layout.process.PaginationStep.performPagebreak(PaginationStep.java:116) at org.pentaho.reporting.engine.classic.core.modules.output.pageable.base.PageableRenderer.performPagination(PageableRenderer.java:134) at org.pentaho.reporting.engine.classic.core.layout.AbstractRenderer.processPage(AbstractRenderer.java:517) at org.pentaho.reporting.engine.classic.core.layout.output.AbstractReportProcessor.processPaginationLevel(AbstractReportProcessor.java:968) at org.pentaho.reporting.engine.classic.core.layout.output.AbstractReportProcessor.prepareReportProcessing(AbstractReportProcessor.java:534) at org.pentaho.reporting.engine.classic.core.modules.output.pageable.graphics.PrintReportProcessor.getNumberOfPages(PrintReportProcessor.java:78) at org.pentaho.reporting.engine.classic.core.modules.gui.base.PreviewPane$RepaginationRunnable.run(PreviewPane.java:271) at org.pentaho.reporting.engine.classic.core.util.Worker.run(Worker.java:174)