测试用例中OFD导出为PDF时出现印章文字复盖

测试用例中OFD导出为PDF时出现印章文字复盖情况
ODF文件为：ofdrw-converter/src/test/resources/999.ofd
gitee示例代码如下：
gitee示例代码
本地代码如下：

public void testOfd2PdfExp() throws IOException {
        Path ofdPath = Paths.get("/home/xxx/temp/1.ofd");
        Path pdfitextPath = Paths.get("/home/xxx/temp/999itext.pdf");
        Path pdfBoxPath = Paths.get("/home/xxx/temp/999box.pdf");
        String docxPath = "/home/xxx/temp/999docx.docx";
        try (OFDExporter exporter = new PDFExporterIText(ofdPath, pdfitextPath)) {
            exporter.export();
        }
        try (OFDExporter exporter = new PDFExporterPDFBox(ofdPath, pdfBoxPath)) {
            exporter.export();
        }
        System.out.println("success...");
    }

预期效果：

实际效果：