Program: 77127
Project: 77127
Buggy source:
protected void repeatHeader(){
  if (isFirst) {
    isFirst=false;
    return;
  }
  ITableBandContent header=(ITableBandContent)groupContent.getHeader();
  if (!isRepeatHeader() || header == null) {
    return;
  }
  if (header.getChildren().isEmpty()) {
    return;
  }
  if (child != null) {
    IContent content=child.getContent();
    if (content instanceof ITableBandContent) {
      if (((ITableBandContent)content).getBandType() == IBandContent.BAND_GROUP_HEADER) {
        return;
      }
    }
  }
  PDFReportLayoutEngine engine=context.getLayoutEngine();
  PDFLayoutEngineContext con=new PDFLayoutEngineContext(engine);
  con.setFactory(new PDFLayoutManagerFactory(con));
  con.setFormat(context.getFormat());
  con.setReport(context.getReport());
  con.setMaxHeight(context.getMaxHeight());
  con.setAllowPageBreak(false);
  IReportItemExecutor headerExecutor=new DOMReportItemExecutor(header);
  headerExecutor.execute();
  PDFTableRegionLM regionLM=new PDFTableRegionLM(con,tableLM.getContent(),tableLM.getLayoutInfo());
  regionLM.initialize(header,tableLM.lastRowArea);
  regionLM.layout();
  TableArea tableRegion=(TableArea)tableLM.getContent().getExtension(IContent.LAYOUT_EXTENSION);
  if (tableRegion != null && tableRegion.getHeight() < this.getMaxAvaHeight() - currentBP) {
    Iterator iter=tableRegion.getChildren();
    RowArea row=null;
    int count=0;
    while (iter.hasNext()) {
      row=(RowArea)iter.next();
      addArea(row);
      count++;
    }
    if (row != null) {
      removeBottomBorder(row);
    }
    tableLM.setRepeatCount(tableLM.getRepeatCount() + count);
  }
  tableLM.getContent().setExtension(IContent.LAYOUT_EXTENSION,null);
}

Fixed version (ground truth):
protected void repeatHeader(){
  if (isFirst) {
    isFirst=false;
    return;
  }
  if (!isCurrentDetailBand()) {
    return;
  }
  ITableBandContent header=(ITableBandContent)groupContent.getHeader();
  if (!isRepeatHeader() || header == null) {
    return;
  }
  if (header.getChildren().isEmpty()) {
    return;
  }
  if (child != null) {
    IContent content=child.getContent();
    if (content instanceof ITableBandContent) {
      if (((ITableBandContent)content).getBandType() == IBandContent.BAND_GROUP_HEADER) {
        return;
      }
    }
  }
  PDFReportLayoutEngine engine=context.getLayoutEngine();
  PDFLayoutEngineContext con=new PDFLayoutEngineContext(engine);
  con.setFactory(new PDFLayoutManagerFactory(con));
  con.setFormat(context.getFormat());
  con.setReport(context.getReport());
  con.setMaxHeight(context.getMaxHeight());
  con.setAllowPageBreak(false);
  IReportItemExecutor headerExecutor=new DOMReportItemExecutor(header);
  headerExecutor.execute();
  PDFTableRegionLM regionLM=new PDFTableRegionLM(con,tableLM.getContent(),tableLM.getLayoutInfo());
  regionLM.initialize(header,tableLM.lastRowArea);
  regionLM.layout();
  TableArea tableRegion=(TableArea)tableLM.getContent().getExtension(IContent.LAYOUT_EXTENSION);
  if (tableRegion != null && tableRegion.getHeight() < this.getMaxAvaHeight() - currentBP) {
    Iterator iter=tableRegion.getChildren();
    RowArea row=null;
    int count=0;
    while (iter.hasNext()) {
      row=(RowArea)iter.next();
      addArea(row);
      count++;
    }
    if (row != null) {
      removeBottomBorder(row);
    }
    tableLM.setRepeatCount(tableLM.getRepeatCount() + count);
  }
  tableLM.getContent().setExtension(IContent.LAYOUT_EXTENSION,null);
}